please help me i’ve got midterms and i’ve been stuck on this for like 45 minutes Dx

If a car is traveling at 50 mph due south at a point 1 mile north of an intersection. the radar gun register at -62.6 mph.

Distance can be defined as how far an object is from another object.

Distance of the first car north of the intersection point =y

Distance of the police car west of the intersection  =x

Distance between the cars =s

s² =x² +y²

x=1.4 miles or 0.25 miles

y =1/2 miles or 0.50 miles

Pythagoreans theorem

Distance between cars

s =√x²+y²

s=√(0.25 miles)² +(0.50 miles)²

s =0.559 miles

Hence,

ds/dt = [0.25 miles/ 0.559 miles (-40 mph)] + [0.50 miles/0.559 miles (-50 mph)

ds/dt = -17.89 + -44.7

ds/dt = - 62.59mph

ds/dt =- 62.6 mph (Approximately)

Therefore the distance is 62.6 mph.

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Answer:

8, 0

Step-by-step explanation:

Answer:

The point on the segment connecting A and B that is 4 times as far from B as it is from A is (-8, 8).

Answer:

or the distance to be 4 times the distance from B as A   the segment must be divided into (4+1) = 5 segments

  so we want the point that is 1/5 of the way from A to B

x    from A   to B   is     2   to   - 6   =   -8 units       1/5 * -8    +  2  =    0.4

y    from A   to B   is     7 to    -3    =   -10 units      1/5 * -10  +  7    = 5    

As per the requirement of body fat measurement, we measure the body fat in continuous data type.

Measureable data is referred to as continuous data. The values in this data are not constant and can take on an endless number of different forms. You can also divide these measures up into smaller, independent components.

Since it may employ decimal points and have infinite values, it is more precise and comprehensive than discrete data.

The type of data that would be used to describe percent of body fat is continuous data. An example of the continuous data type is Height of a person.

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Answer:

A. Imaginary Square is 1 so ye ignore

Answer:

7 cm ; 10 cm ; 14 cm

Step-by-step explanation:

x = y + 3

z = 2y

x + y + z = 31

y + 3 + y + 2y = 31

4y = 31 -3

4y = 28

4/4 y = 28/4

y = 7

z = 7(2) = 14

x = 7 + 3 = 10

Yes, these values indicate a difference in popularity. Using a 0.01 significance level, the p-value for this test is 0.0018, which is less than the significance level.

This means that there is statistical evidence to support the claim that there is a difference in the candidate's popularity between men and women.

1. The candidate has a population of voters that he wishes to test to see if there is a difference in his popularity between men and women.

2. He conducts a survey of 250 men and 250 women, 44% of the men favoring his candidacy and 52% of the women favoring his candidacy.

3. To determine if there is a significant difference between the two samples, we first calculate the difference in proportions between the two groups:

52% - 44% = 8%.

4. We then use a 0.01 significance level to conduct a two-tailed z-test for proportions to determine if there is a statistically significant difference between the two groups.

5. The p-value for this test is 0.0018, which is less than the significance level of 0.01.

6. This means that there is statistical evidence to support the claim that there is a difference in the candidate's popularity between men and women.

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Converting 7π/21 to degrees will be 60°.

Expression simply refers to the mathematical statements which have at least two terms which are related by an operator and contain either numbers, variables, or both.

A plane angle is measured in degrees, with the letter ° typically used to indicate that one full rotation is equal to 360 degrees. Although it is not a SI unit—the radian is the SI unit of angular measure—it is mentioned as an accepted unit in the SI brochure.

Angles are measured in terms of radians. Angles are measured using the degree and radian units. In calculus and the majority of other branches of mathematics, angles are typically or generally measured in radians.

It should be noted that in order to convert radians yo degrees, you've to multiply by 180/π since a full circle is 360°.

This will be illustrated as:

= 7π / 21 × 180 / π

= 7/21 × 180

= 60°

The value is 60°.

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Answer:

f(x)=7

Step-by-step explanation:

f(x)= 1/2x+5 ; x=4

f(4)= 1/2(4)+5

f(4)= 2+5

f(x)=7

Hope this helps, because I just did this lesson and I was confused at first, but with practice you will get it!

Answer:

u > -11/10

Step-by-step explanation:

The cyclist takes 0.36 hours to travel 4.5 miles.

Here given that,

The distance travelled by the cyclist 3.75 miles.

Time = 0.3 hour

Distance / Time = Speed

By substituting,

3.75 / 0.3

= 12.5 miles per hour is the speed.

2) Distance = 4.5 miles, speed = 12.5 miles per hour.

Distance / Speed = Time

Time = 4.5 / 12.5

=0.36 hours

Therefore it takes 0.36 hours to travel 4.5 miles.

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Answer: 39 crackers

Step-by-step explanation:

There are seven days a week

Only Friday, he eats half, so 6 left

6 times 6 = 36

36+ 3= 39

The expression that shows how many sweatshirts were not adult sizes is  s - 19 .

Given :

the lacrosse team sold s team booster sweatshirts, and 19 of them were adult sizes.

Expression :

An expression in math is a sentence with a minimum of two numbers or variables and at least one math operation.

Expression = number of sold sweatshirts - number of adult sizes.

= s - 19.

This gives the number of sweatshirts that are not adult sizes

if s = 25

then not adult sizes sweatshirts = s - 19

= 25 - 19

= 6

Hence the expression is s - 19.

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There are 45 different ways in which two of them can be selected as the best students in the class.

A combination in mathematics is a choice made from a group of separate elements where the order of the selection is irrelevant (unlike permutations).

A k-combination of a set S is officially defined as a subset of S's k unique elements.

Total number of students = 10

Number of students to be selected = 2

No. of ways = 10C2

                   = (10*9)/2

                   = 5*9

                   = 45

Hence, there are 45 different ways in which two of them can be selected as the best students in the class.

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Answer: No, it is not proportional.

Explanation:

We can see that Diego opened an account with $20, meaning that there is going to be a y-intercept of 20 in a graph. Therefore, with a y-intercept of 20 and not zero, we can say that there is not a proportional relationship between and time and amount saved for Diego.

Answer:

B

Step-by-step explanation:

Answer choice B would equal -3/4

The inequality that can be used to determine the number of books, b, Erin must sell in order to meet her goal of making more than $180 in book sales is 12b ≥ 180.

2. The solution to the inequality 12b ≥ 180 is that b ≥ 15.

Inequality is a mathematical statement that two or more mathematical expressions are unequal because their solutions are not equivalent in value.

Inequalities are depicted as less than (<), more than (>), not equal to (≠), less than or equal to (≤), and more than or equal to (≥).

The selling price per book = $12

The total sales revenue expected is ≥ $180

The number of books = b

Inequality describing the situation = 12b ≥ 180

b ≥ 180 ÷ 12

b ≥ 15

Thus, we can conclude that Erin needs to sell 15 or more books to earn $180 or more from the book sales.

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Y= 2.5x equation represent their relationship .

An equation is a formula that is express the equality of two expressions ,by the connecting them with the equal sign .

The process of equting one thing with another is called the equation of science with objective .

The equation is representing direct proportion is, by the connecting them with in the equal sign.

y = kx ← k is the constant of proportion

Here k = 2.5 , thus

y = 2.5x ← equation of proportion.

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Answer: A) y = 5x – 13

Step-by-step explanation:

The equation is y=mx + b

We know the slope is 5 and the y-intercept is at ( 0, -13)

So our equation is y = 5x - 13

So, the answer is A

The simplest form of the ratio r:h:u is 5 : 8 : 14.

What is the ratio?

A ratio in mathematics demonstrates how many times one number is present in another. For instance, if a dish of the fruit contains eight oranges and six lemons, the ratio of oranges to lemons is eight to six. The ratio of oranges to the overall amount of fruit is 8:14, and the ratio of lemons to oranges is 6:8.

We have,

r : h  = 5 : 8   .........(i)

h : u =  4:7    ........(ii)

Multiplying the (i) and (ii) by numbers that will make 'h' have the same value in the ratios

Multiplying (i) by 1

(r : h)*1  = (5 : 8)*1

= r : h  = 5 : 8  

Multiplying (ii) by 2

(h : u)*2 =  (4:7) *2

= 8 : 14

the ratio r : h : u in the simplest form = 5 : 8 : 14.

Hence, the simplest form of the ratio r:h:u is 5 : 8 : 14.

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Answer:

0

Step-by-step explanation:

10x + 12 = 2(5x+6)

or, 10x + 12 = 10x + 12

or, 10x - 10x = 12 - 12

or, 0 = 0

.

. . so, 0 is the answer.

Step-by-step explanation:

10x + 12 = 2(5x + 6)

10x + 12 = 10x + 12

10x + 12 = 10x + 12

10x + 12 - 12 = 10x + 12 - 12

10x = 10x

10x - 10x = 10x - 10x

____________________________________________

Number of servings that are in a full box of cereal is 8.33 servings

Total quantity of cereal contains in the box = [tex]12\frac{1}{2}[/tex] cups

Convert the mixed fraction to simple fraction

[tex]12\frac{1}{2}[/tex] cups = 25/2 cups

Total quantity of cereal eats in each serving = [tex]1\frac{1}{2}[/tex] cups

Convert the mixed fraction to simple fraction

[tex]1\frac{1}{2}[/tex] cups = 3/2 cups

Number of servings in a full box of cereal = Total quantity of cereal contains in the box ÷ Total quantity of cereal eats in each serving

Here we have to use the division

Substitute the values in the equation

Number of servings in a full box of cereal = 25/2 ÷ 3/2

= 25/2 × 2/3

= 25/3

= 8.33

Therefore, a full box contains 8.33 servings

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Answer:

A

Step-by-step explanation:

since the triangles are congruent then corresponding sides are congruent.

Δ PQR  congruent to Δ PNM

PR and PM are corresponding sides , then

PM = PR = b

Answer: 40%

Step-by-step explanation:

Take 10 divided by 25; then times 100 = 40%

Answer:

60

Step-by-step explanation1

135 = 2x+15 => corresponding angles

2x= 135-15

2x= 120

x= 60

Answer:i don’t know

Step-by-step explanation:

Answer:

5

Step-by-step explanation:

[tex] {x}^{3} - {2xy}^{2} + {y}^{3} \\ {( - 2)}^{3} - 2( - 2)(3) {}^{2} + {3}^{3} \\ - 8 + 4 - 18 + 27 \\ 31 - 26 = 5[/tex]

Answer:

55

Step-by-step explanation:

1. Substitute in the values

  -2^3 - ( 2 * -2 * 3^2 ) + 3^3

2. Simplify the powers

  -8 - ( 2 * -2 * 9 ) + 27

3. Solve the brackets

  -8 - ( -4 * 9 ) + 27

  -8 - ( -36 ) + 27

  -8 + 36 + 27

4. Solve

  -8 + 63

  55

Answer:  Just add them up. 5 1/20

Step-by-step explanation:

1+1+2=4. For the fractions, find the LCM. The LCM is 20 so you make all the fractions denominator 20. 2/20, 4/20, 15/20. Now you get 5 1/20 in the end

The transformation from f(x) = -7|x| + 7 to  g(x) =  7|x|- 7 is-

The graph of f(x) has been moved 14 units down. Then it is rotated upwards to get the graph of g(x)

What is rotation?

The mathematical transformation which turns a geometrical figure about a fixed point is called rotation. The fixed point is called center of rotation.

f(x)= –7|x|+7

g(x) =  7|x|- 7

At first the graph of f(x) has been moved 14 units down. Then it is rotated upwards to get the graph of g(x)

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