Johnny has some nickels and dimes in his pocket, and the change is worth $0.75. He has twice as many dimes as nickels. How many of each type of coin does Johnny have?
| BTW this is a system of equations question

Answer: B

Step-by-step explanation:

Answer:

Left bottom graph is the correct one.

Answer: The bottom left graph

Step-by-step explanation: The top two are decreasing, so you can rule those answers out. The bottom right one is increasing by more than 4, so that wouldn’t be the answer either. That leaves you with one option which fits the description of the graph.

Answer:

Marcy got 16 wrong.

Step-by-step explanation:

You simply multiply 1 ( from the missed side of the ratio ) by 4 ( how many Marcy got wrong ) which equals 4. Then you do the same to the other side. 4 ( from the "correct" side of the ratio ) by 4 ( how many Marcy got wrong ). 4 x 4 is 16. So, Marcy got 16 wrong.

Answer:

16

Step-by-step explanation:

The ratio is 1:4 means for 1 wrong word, she got 4 words correct. If she has 4 words wrong, multiply that with 4 and you got 16.

The probability that the frog will escape without being eaten by the snake is [tex]\frac{63}{146}[/tex]

What is Markov Process?

A Markov chain or Markov process is a stochastic model that depicts a series of potential occurrences where each event's likelihood is solely determined by the state it reached in the preceding event.

First, take notice that the frog has a probability of 1/2 of finally being eaten by the snake once it is on pad 5, and a probability of 1/2 of eventually emerging from the pond unharmed. Therefore, all that needs to be determined is the probability that the frog on pad 1 will make it to pad 5 without being eaten.

Consider the frog’s jumps in pairs. The frog on pad 1 will advance to pad 3 with probability [tex]\frac{9}{10} \frac{8}{10}[/tex][tex]=\frac{72}{100}[/tex] will be back at pad 1 with probability [tex]\frac{9}{10} \frac{2}{10}[/tex][tex]=\frac{18\\}{100}[/tex]

s

[tex]\frac{72}{100}[/tex] ÷  [tex](\frac{72}{100}+\frac{10}{100} )=\frac{36}{41}[/tex]   and the probability that it ultimately makes it to pad 0 is [tex]\frac{10}{100}[/tex] ÷ [tex](\frac{72}{100}+\frac{10}{100} )=\frac{5}{41}[/tex].Similarly, in a pair of jumps the frog will advance from pad 3 to pad 5 with probability [tex]\frac{7}{10} \frac{6}{10} =\frac{42}{100}[/tex], will be back at pad 3 with probability [tex]\frac{7}{10} \frac{4}{10} +\frac{3}{10} \frac{8}{10} =\frac{52}{100}[/tex].

Because the frog will ultimately make it to pad 5 or pad 1 from pad 3, the probability that it ultimately makes it to pad 5 is [tex]\frac{42}{100}[/tex] ÷ [tex]( \frac{42}{100} +\frac{6}{100} )=\frac{7}{8}[/tex] and the probability that it ultimately makes it to pad 1 is [tex]\frac{6}{100}[/tex] ÷ [tex](\frac{42}{100} +\frac{6}{100} )=\frac{1}{8}[/tex]

The series of steps that must be made in pairs for the frog to get to pad 5 without being eaten is

1 → 3 → 5, 1 → 3 → 1 → 3 → 5, 1 → 3 → 1 → 3 → 1 → 3 → 5 and so on.

The sum of the respective probabilities of reaching pad 5 is then

[tex]\frac{36}{41} \frac{7}{8} +\frac{36}{41} \frac{1}{8} \frac{36}{41} \frac{7}{8}+\frac{36}{41} \frac{1}{8} \frac{36}{41} \frac{1}{8} \frac{36}{41} \frac{7}{8}+.....[/tex]

[tex]= \frac{63}{82} (1+\frac{9}{82} +(\frac{9}{82})^{2} +....)[/tex]

[tex]=\frac{63}{82}[/tex]÷[tex](1-\frac{9}{82} )[/tex]

[tex]= \frac{63}{73}[/tex]

Therefore the requested probability is [tex]\frac{1}{2}\frac{63}{73} = \frac{63}{146}[/tex]

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Answer: 26

Step-by-step explanation:

1. Make an equation

n+n+2+n+4=78

(You have n+2 because to get to the next even number you'd have to add 2. For example, 2 is even, to get to the next even number, 4, you have you add 2.)

2. Combine like terms

3n+6=78

3. Solve for n

3n=72

n=24

4. Solve for the second number

(The second number would be n+2)\

n+2

24+2

26

ANSWER: 26

Answer:

simplify - 3x^2xy-(-3x^2) x 2x ^3y^2^z: -3x^3y+6x^2+3y2z

Using theories of Rhode island ,we got that when the British ship Gaspee ran a ground in Rhode island, the local population 1) burned it.

On June 9, Gaspee gave chase to the packet ship Hannah, but the Gaspee ran aground in shallow water on the northwestern side of  bay on what is now Gaspee Point. Her crew were unable to free her and the Dudingston decided to wait for the high tide, which would possibly set the vessel afloat. Before that could happen, however, the band of Providence men led by John Brown decided to act on a "opportunity offered of putting an end to the trouble and the vexation she daily caused."  They rowed out to the ship and boarded at the break of dawn on June 10.

Hence, when the british ship gaspee ran aground in rhode island, the local population 1) burned it.

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Answer:

14/x+3

Step-by-step explanation:

The value of variable x is 16.5 using the cross-multiplication method.

The denominator of the first term is multiplied by the numerator of the second term when utilizing the cross-multiplication method.

In mathematics, more specifically in elementary arithmetic and elementary algebra, one could cross-multiply an equation between two fractions or rational expressions to make the equation easier or to determine the value of a variable.

So, the value of x will be:

Use the cross-multiplication method as follows:

2x-7/4 = x+3/3

3(2x-7) = 4(x+3)

6x - 21 = 4x + 12

2x = 12 + 21

2x = 33

x = 33/2

x = 16.5

Therefore, the value of variable x is 16.5 using the cross-multiplication method.

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Correct question:
Obtain the value of x.

To rewrite the expression 12x+8 to find an equivalent expression.

The answer is

 12 x + 8 is equivalent to 4(3x + 2) is equivalent to  

 3x + 3x+3x+3x + 2 +2+2+2 is  equivalent to (x+x+x)+(x+x+x)+(x+x+x)+(x+x+x)+2+2+2+2

Therefore these are the possible expressions

Step: 1

Here given that,

Rewrite the expression 12x + 8 to find an equivalent expression. Show three possible expressions. What do the rewritten expressions tell you about the relationships among the quantities.

Step: 2

When you rewrite an expression, you are writing an equivalent expression. 

 12 x + 8 is equivalent to 4(3x + 2) is equivalent to  

 3x + 3x+3x+3x + 2 +2+2+2 is equivalent to  

(x+x+x)+(x+x+x)+(x+x+x)+(x+x+x)+2+2+2+2

Therefore these are the possible expressions

Hence the answer is

 12 x + 8 is equivalent to 4(3x + 2) is equivalent to  

 3x + 3x+3x+3x + 2 +2+2+2 is equivalent to  

(x+x+x)+(x+x+x)+(x+x+x)+(x+x+x)+2+2+2+2

Therefore these are the possible expressions

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Answer:

you will need to go 80 km per hr

Step-by-step explanation:

Answer: hi

Step-by-step explanation:

The number of displays are possible is 3

Total number of species Lightning bugs = 69

We have to arrange the same number of Lightning bugs in each row

First find the factors of the number 69

The factors of 69 = 1, 3, 23, 69

First combination is (1 × 69)

Arrange 1 Lightning bug in each row, then the number of rows will be 69

(3 × 23)

Arrange 3 Lightning bugs in each rows, then the number or rows will be 23

(23 × 3)

Arrange 23 Lightning bugs in each rows, then the number of rows will be 3

Hence, the number of displays are possible is 3

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The product of f(x) and g(x) is -2x² +16x -24.

A function is a relation such that there is only one unique output for every input.

Given that, the functions, f(x) = x-6 and g(x) = -2x + 4.

The value of f(x) × g(x) is,

f(x) × g(x)

= (x-6)(-2x+4)

= -2x²+4x + 12x -24

= -2x² +16x -24

Hence, the product of f(x) and g(x) is -2x² +16x -24.

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The inequality results to f > -3.

Mathematical expressions with inequalities are those in which the two sides are not equal. Contrary to equations, we compare two values in inequality. Less than (or less than or equal to), greater than (or greater than or equal to), or not equal to signs are used in place of the equal sign.

Given:

-2f-3.7 < 2.3

Now, solving the inequality

Add 3.7 both side

-2f-3.7 + 3.7 < 2.3 + 3.7

-2f< 6

Divide both side by 2.

-f< 3

f> -3

Hence, the inequality results to f > -3.

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By using ratio, it is calculated that John have 42 sweets.

What is ratio?

Ratio between two quantity tells us how much bigger is one quantity as compared to the other quantity.

The first part of the ratio is called antecedent and the second part of the ratio is called consequent

Vicky and John share some sweets in the ratio 2:7

Let Vick shares 2x sweets and John shares 7x sweets

Vicky ends up with 12 sweets

By the problem,

[tex]2x = 12\\x = \frac{12}{2}\\x = 6[/tex]

Number of sweets John have = [tex]7 \times 6 = 42[/tex]

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99% confidence Interval for the mean number of hours a student studies per week is (21.0208,18.9792)

Given:

mean x = 20

standard deviation σ = 3.5

sample size n = 78

z score for 99% = 2.576

Interval = x±z*s/[tex]\sqrt{n}[/tex]

= 20±2.576*3.5/[tex]\sqrt{78}[/tex]

= 20±2.576*0.39629

= 20±1.0208

Interval = (21.0208,18.9792)

Therefore 99% confidence Interval for the mean number of hours a student studies per week is (21.0208,18.9792).

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A wire is cut into two pieces, one piece bent into square and other piece will be bent into circle. Therefore, the minimum length of wire that can be used is 43 m.

The relationships between the radius of a circle and its circumference and area are :

                                           C = 2πr

                                            A = πr²

The relationships between the side length of a square and its perimeter and area are :

                                        P = 4s

                                        A = s²

So, the length of wire will be

                         W= C + P

                        W = 2πr + 4s

Subject to the constraint that the sum of areas is 144 m²:

                                 πr² + s² = 144

Using the method of Lagrange multipliers to find the extremes of wire length, we want to set the partial derivatives of the Lagrangian (L) to zero.

                       L = 2πr + 4s + λ(πr² +s² -144)

                   ∂L/∂r = 0 = 2π +2πλr      ------------------------------- (1)

                   ∂L/∂s = 0 = 4 +2λs           ------------------------------- (2)

                   ∂L/∂λ = 0 = πr² +s² -144    -------------------------------- (3)

Solving for λ, we find,

                   1 +λr = 0      ---------------------------- (4)

                ⇒  λ = -1/r      ----------------------------- (5)

Substituting into equation (2), we get,

                  4 + 2(-1/r)s = 4

               ⇒  s/r = 2  -------------------------------- (6)

This tells us the maximum wire length is that which makes the circle diameter equal to the side of the square.

Substituting the relation s=2r into the area constraint, we find,

                          πr² +(2r)² =144  

                      ⇒  r = √(144/(π+4))

                      ⇒  r= 12/√(π+4) ≈ 2.068965 . . . m

∴ The minimum wire length will be required when the entire area is enclosed by the circle. In that case,

                           πr² = 144

                        ⇒  r = √(144/π)

           and,           C = 2πr

                         = 2π√(144/π)

                         = 24√π ≈42.5388 . . m

rounding up the minimum value 42.5388... in 43.

∴ The minimum wire length will be required is 43 m

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There is no null hypothesis in this situation there is no differences in the opinions about marriage between men and women

In the field of science, hypothesis testing is an effective method of determining whether or not there is a relationship between two or more variables. A null hypothesis is a default position or a general statement that no relationship or connection exists between the given variables.

The hypothesis is then tested, and based on the results of the tests, a conclusion is drawn either approving or rejecting the null hypothesis.

In the given situation, where the researcher predicted that women would have different opinions about marriage than men, the null hypothesis could be formulated because there is no difference in the opinions of men and women about marriage.

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If t=1, then d=3:  In 1 minute, the snail traveled 3 inches.

If t=2, then d=6:  In 2 minutes, the snail traveled 6 inches.

If t=3, then d=9:  In 3 minute, the snail traveled 9 inches.

The snails speed is 3 inches per minute.  That's what the 3 represents.  The change in distance (inches) for each minute that passes.

The angles in the figure are:

∠PQR = 45°

∠POR = 90°

Given : O is the centre of circle, ∠OPQ = 25° and ∠ ORQ = 20°

To Find : ​values of ∠ POR and ∠ PQR.

OP = OQ  = Radius

⇒ ∠OPQ = ∠OQP  

⇒ ∠OQP = 25°

OR = OQ  = Radius

⇒ ∠OQR = ∠ORQ

⇒ ∠OQR = 20°

∠PQR = ∠OQP + ∠OQR

⇒ ∠PQR =   25° + 20°

⇒ ∠PQR =   45°

∠POR = 2∠PQR

⇒ ∠POR = 2*45°

⇒  ∠POR = 90°

Hence we get the two angles as 45° and 90° respectively.

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Answer:

To find the rate of change in a table, the same process applies:

Step-by-step explanation:

1. Find the coordinates of the given points. It's optional to label them.

2. Find the difference between the output values.

3. Find the difference between the input values.

4. Calculate the ratio between the change in y to the change in x: ΔyΔx.

The system of equation for the following conditions contains equation the equations: x + y ≤ 30 and 9x + 15y 240.

What is system of equation?

A system of equations in algebra consists of two or more equations and looks for common answers to the equations. "A set of equations satisfied by the same set of variables is called a system of linear equations."

Let the hours Alisa work for lawn mowing job is "x" hours and for coaching job is "y" hours.

As given in the question, Alisa can work at most 30 hours.

So the total working hours should be equal or less that 30 hours.

Therefore, the first equation can be written as:

x + y ≤ 30

And it is also given that, she needs to earn at least $240, while Her lawn mowing job pays $9 an hour, and her coaching job pays $15 for an hour.

So, Total earning = per hour earning x total hour

lawn mowing job earning = 9(x)

coaching job earning = 15(y)

Therefore, the second equation can be written as:

9x + 15y 240

Hence, the system of equation is: x + y ≤ 30 and 9x + 15y 240

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Answer:

also called a tariff.

Step-by-step explanation:

Please give the brainliest.

Answer: 10

Step-by-step explanation: it’s 10 because 2 is a multiple of 10 and 10 is 10 so no change required.

Answer:

LCD = 10

Step-by-step explanation:

7/2 = 35/10

3/10 = 3/10

Answer:

I believe it would be 300 dollars per week, I hope this was right :)

Step-by-step explanation:

.4x750=300

The expression can be written without negative exponents as 64xy²

Exponent is defined as the method of expressing large numbers in terms of powers. That means, exponent refers to how many times a number multiplied by itself. For example, 6 is multiplied by itself 4 times, i.e. 6 × 6 × 6 × 6. This can be written as 6⁴. Here, 4 is the exponent and 6 is the base.

Simplifying exponents is a method of simplifying the algebraic expressions involving exponents into a less complex form in a way that they cannot further be reduced. There are methods in algebra for simplifying exponents with different and same bases that we can use.

Steps to solving basic problems like this are;

Step 1

remove parentheses by multiplying factors.

Step 2

use exponent rules to remove parentheses in terms with exponents.

Step 3

combine like terms by adding coefficients.

Step 4

combine the constants.

In this case, we have an expression;

8√x²y⁴ which can be rewritten without using the square.

8√x²y⁴ = 64xy²

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Answer:   p = 9 - 0.5s

Optionally you can replace 0.5 with the fraction 1/2

===================================================

Explanation:

s = number of slices

0.5s = total width of all of those slices mentioned

9-0.5s = amount left over.

For example, if he eats s = 4 slices then he has eaten 0.5s = 0.5*4 = 2 inches of bread, and there are 9-2 = 7 inches left.

Notice how 9-0.5s=9-0.5*4 = 9-2 = 7.

The equation p = 9 - 0.5s is not an inverse variation because it's not in the form p = k/s, where k is some constant.

The values of x and y are not in a linear relationship.

Given,

x y

1 4.3

2 8.6

3 12.9

4 16.3

The linear relationship between x and y can be determined by using,

[tex]y=kx\\k=\frac{y}{x}[/tex]

Where, k=constant rate of change

If k is same for all values of x and y then the given data are said to be in linear relationship.

At first row,

[tex]k=\frac{4.3}{1} =4.3[/tex]

At second row,

[tex]k=\frac{8.6}{2}=4.3[/tex]

At third row,

[tex]k=\frac{12.9}{3}=4.3[/tex]

At fourth row,

[tex]k=\frac{16.3}{4} =4.075[/tex]

So, the k is not same for all values for x and y. Hence, the given data is non linear

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