Terry needs 40 gal of a 40% acid solution. The only available acid solutions are 25% and 80% acid. How much of each should she mix together (to the nearest gallon)?

Answer:

1,148

Step-by-step explanation:

For the given composite function, then values of

(a) 63x + 8

(b) 63x + 56

(c) 81x + 80

(d) 49x

Composite functions:

An operation where two functions say f and g generate a new function say h in such a way that h(x) = g(f(x)) is known as composite functions.

Given,

Here we have the functions f(x) = 9x + 8 and g(x) = 7x

Now, we have to find the composite function of each.

(a) The composite function is written as,

=> f(g(x)) =f(7x)

=> f(7x) = 9(7x) + 8

=> f(g(x)) = 63x+ 8

(b) The composite function is written as,

=> g(f(x))

=> g(f(x)) =g(9x + 8)

=> g(9x + 8) = 7(9x + 8)

=> g(9x + 8) = 63x + 56

(c) The composite function is written as,

=>  f(f(x))

=> f(9x +8) = 9(9x + 8) + 8

=> f(9x + 8) = 81x + 72 +8

=> f(9x + 8) = 81x + 80

(d) The composite function is written as,

=> g(g(x))

=> g(7x) = 7(7x)

=> g(7x) = 49x

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Answer:

  (a)  68 grams

  (b)  42.5%

Step-by-step explanation:

You mix 100 g of 35% copper with 60 g of 55% copper to form an alloy. You want to know the number of grams and the percentage of copper in the mixture.

The total amount of copper is ...

  0.35·(100 g) +0.55·(60 g) = 35 g + 33 g = 68 g

There are 68 grams of copper in the resulting mixture.

The percentage of copper in the mixture is ...

  (68 g)/(100 g + 60 g) × 100% = 68/160 × 100% = 42.5%

The resulting mixture is 42.5% copper.

Answer:

x=47

Step-by-step explanation:

Sum of all three angles of a triangle is 180 degrees

We know one angle which is 51 degrees

The second is 73 degrees since it’s corresponding angle is 73 degrees

73+51=124

Now subtract this from 180

180-124=56

We can set x+9 equal to this

X+9=56

  -9.  -9

x=47

Hopes this helps please mark brainliest

Part a; compounded semiannually (n = 2); CI =  $6,390.

Part b: compounded quarterly ( n = 4) ; CI =  $6,425

Part c: compounded monthly (n = 12): CI =  $6,450

Part d: compounded continuously; CI =  $6,467.

The compound interest is calumniated by formula.

A = P(1 + r/100n)∧nt

In which,

A  = amount after compounding

P = principal amount  ($20,000 )

n = number of time principal amount compounded in a year.

t = total time in years (7 years)

r= rate of interest (4%)

Part a; compounded semiannually (n = 2)

A = P(1 + r/100n)∧nt

A = 20,000(1 + 4/200)∧(2x7)

A = 26390

CI = A - P

CI =  26,390 -  20,000

CI =  $6,390.

Part b: compounded quarterly ( n = 4)

A = 20,000(1 + 4/400)∧(4x7)

A = 26425

CI = A - P

CI =  26,425 -  20,000

CI =  $6,425

Part c: compounded monthly (n = 12)

A = 20,000(1 + 4/1200)∧(12x7)

A = 26450

CI = A - P

CI =  26,450-  20,000

CI =  $6,450

Part d: compounded continuously.

P = P₀e∧rt

P = (20,000)(2.72)∧(0.04 x 7)

P = 20,000 x 1.32

P = 26,467

CI =  26,467 - 20, 000

CI =  $6,467.

Thus, the for compounded continuously is $6,467.

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The height of the arrow at 2.5 seconds is 71 feet.

Given:

An arrow released from a bow, traveling towards a target 200 yards away,reaches a max height of 42.6 ft in only 1.5 seconds.

1.5 seconds = 42.6 feet

divide by 1.5 on both sides.

1 sec = 28.4 feet

0.5 sec = 28.4/2

0.5 sec = 14.2 feet

2.5 sec = 1.5 sec + 1 sec

= 42.6 + 28.4

= 71 feet

Therefore The height of the arrow at 2.5 seconds is 71 feet.

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3.5m + 2.5 = 79.5 is the equation that could be used to determine m, the number of miles in the taxi ride.

Given in question,

Pick-up fee = $2.50

Fee per mile = $3.50

Total fare = $79.50

Let the no. of miles = m

Fee for m miles = 3.50m

Equation, 3.50m + 2.50 = 79.50.

Hence, the equation is 3.50m + 2.50 = 79.50.

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Answer:

75% - 20% = 55%

Step-by-step explanation:

Answer:

[tex]\frac{2x\sqrt{3y}}{{3y}}[/tex]

Step-by-step explanation:

Apply fractional law for squares:

[tex]\sqrt{\frac{4x^2}{3y}} = \frac{\sqrt{4x^2}}{\sqrt{{3y}}}[/tex]

Then simply:

[tex]\frac{2x}{\sqrt{{3y}}}[/tex]

Rationalize denominator:

[tex]\frac{2x}{\sqrt{{3y}}} \cdot \frac{\sqrt{{3y}}}{\sqrt{{3y}}} = \frac{2x\sqrt{3y}}{{3y}}[/tex]

Answers in bold

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

Explanation:

Always start the proof with what you are given. It seems silly to repeat the given information, but it's just how all proofs are formed. This is to build from those given statements to lead to what we want to prove on the last line.

The term "midpoint" refers to splitting a segment into two equal smaller pieces. So for instance, if Q is the midpoint of PR, then the pieces PQ and QR are equal. Each smaller piece is half as long as PR.

The transitive property is the idea if A = B and B = C, then A = C. Think of it like substitution. Or you can think of a set of dominoes: A knocks down B, which knocks down C. Therefore A knocks down C.

The addition property of equality is where we go from A = B to A+C = B+C. I've added C to both sides. Adding the same thing to both sides will not change the equation. It keeps things balanced. When going from line 4 to line 5, we added PQ to both sides.

In line 6, we've gone from PQ+PQ to 2PQ.

In line 7, we replace PQ with QR on the right hand side. We use the substitution property here (refer to line 3 where we found PQ = QR)

Line 8 uses the segment addition postulate. If A,B,C are collinear, then AB+BC = AC. The point B doesn't necessarily need to be the midpoint.

Line 9 uses the transitive property again (we combine lines 7 and 8 to lead to line 9).

The final line has us divide both sides by 2 to get what is shown in the table. This is the division property of equality.

------------------------

Shortcut using informal logic:

PQ = QR

QR is half as long as QS

Therefore, PQ is also half as long as QS

Answer:

The last reason for  [tex]PQ=\frac{1}{2}QS[/tex]  is division property of equality

Step-by-step explanation:

The reason for  [tex]PQ=\frac{1}{2}QS[/tex]  can be evaluated as follows    

For the statement [tex]Q[/tex] is the midpoint of [tex]\overline{PR}[/tex], the reason is given

For the statement [tex]R[/tex] is the midpoint of [tex]\overline{QS}[/tex], the reason is given

For the statement [tex]PQ=QR, QR=RS[/tex] , the reason is definition of midpoint

The midpoint of a line segment is the point that separates the line segment into two congruent parts.

For the statement [tex]PQ=RS[/tex] , the reason is transitive property

Transitive property says that if [tex]a=b[/tex], and [tex]b=c[/tex], then [tex]a=c[/tex]

In this statement [tex]PQ=QR, QR=RS[/tex], then [tex]PQ=RS[/tex]

For the statement [tex]PQ+PQ=PQ+RS[/tex] , the reason is addition property of equality

Addition property of equality says that if [tex]a=b[/tex], then [tex]a+c=b+c[/tex]

For the statement [tex]2PQ=PQ+RS[/tex] , the reason is combining of like terms of algebraic expression

Combining like terms is the process to add or to substract the coefficient of the terms

In this statement combining like terms is at the left side of the equation,  [tex]PQ+PQ=2PQ[/tex]

For the statement [tex]2PQ=QR+RS[/tex] , the reason is substitution property

Substitution property of equality says that if [tex]a=b[/tex], then [tex]a[/tex] replaces [tex]b[/tex] in any equation, in this statement [tex]QR[/tex] replaces [tex]PQ[/tex]

For the statement [tex]QR+RS=QS[/tex] , the reason is substitution property and definition of midpoint

In this statement [tex]QR+RS[/tex] replaces [tex]2PQ[/tex], and [tex]QS[/tex]  is the sum of two congruent parts  [tex]QR+RS[/tex]

For the statement [tex]2PQ=QS[/tex] , the reason is substitution property

In this statement [tex]2PQ[/tex] replaces [tex]QR+RS[/tex]

For the statement  [tex]PQ=\frac{1}{2}QS[/tex]  , the reason is division property of equality

Division property of equality says that if [tex]a=b[/tex], and [tex]c\neq 0[/tex], then [tex]\frac{a}{c} =\frac{b}{c}[/tex]

In this statement [tex]\frac{2PQ}{2} =\frac{QS}{2}[/tex] or can be reduced into [tex]PQ=\frac{1}{2}QS[/tex]

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Answer:

0

Step-by-step explanation:

Answer:

choose 3rd option

Step-by-step explanation:

The distance formula used to determine if the figure is a parallelogram indicates;

A parallelogram is a quadrilateral that have two pairs of facing sides that are parallel and of the same length.

The length of the sides can be found by using the formula for finding the distance between two points on the coordinate plane as follows;

The distance between the points (x₁, y₁) and (x₂, y₂) is d = √(x₂ - x₁)² + (y₂ - y₁)²

The length of QR = √((1 - (-10))² + (-1 - (-2))²) = √(122) ≈ 11.0

Length of ST = √((1 - (-11))² + (-7 - (-8))²) = √(145) ≈ 12.0

Length of QS = √((1 - (-10))² + (-7 - (-2))²) = √(146) ≈ 12.1

Length of RT = √((1 - (-11))² + (-1 - (-8))²) = √(193) ≈ 13.9

The lengths of the opposite sides of a parallelogram are the same. The lengths of the sides of the quadrilateral QRST are different, therefore, quadrilateral QRST is not a parallelogram.

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The area of this triangle is 21 square units.

From the graph:

The length of the base = 4 + 3 units

= 7 units

The length of the height = 3 + 3

= 6 units

Area of the triangle = 1/2 b *h

= 1/2*7*6

= 1*42/2

= 42/2

= 21 square units.

Therefore the area of this triangle is 21 square units.

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The relationship of the battery represent a proportional relationship and the constant is 7.7 pounds.

From the information, 6 car batteries weigh 46.2 pounds. The weight per battery will be:

= 46.2 / 6

= 7.7 pounds

Also, rourteen car batteries weigh 107.8 pounds, the weight per battery will be:

= 107.8 / 14

= 7.7 pounds

The constant of proportionality is 7.7.

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The amount that the patient is receiving, in mcg/min, using proportions, is of:

1008 mcg/min.

A proportion represents a unit rate relative to a total amount, and this unit rate is used along basic arithmetic operations, especially multiplication and division, to find the desired measures in the context of a problem.

Considering than an hour has 60 minutes, the amount infused each minute is given as follows:

40.5/60 = 0.675 mL/min.

The rate of milligrams per milliliters is given as follows:

400/250 = 1.6 mg per mL.

Hence the number of mg received per minute is:

1.6 x 0.675 = 1.08 mg per minute.

1 mg equals 1000 mcg, hence the number of mcg received per minute is:

1.08 x 1000 = 1008 mcg/min.

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Answer:25/.2

Step-by-step explanation:

i think this is right

Answer:

The answer would be 4 7/24

Step-by-step explanation:

We can obtain common denominators by multiplying both numerator (top) and denominator (bottom) by the same amount.

The LCM (least common multiple) for your question would be 24, so you would multiply in order to get the fractions to have a common denominator of 24, while keeping the same value.

Answer:

Okay, so let's make the variable x the 60% juice.

The equation:

0.60(x) + 1(120-x) = 0.7(120)

Multiply both sides by ten for easier calculation:

6x + 1200 - 10x = 840

Put x on one side and the numbers on the other:

-4x = -360

the negatives cancel out...

4x = 360

define x

x = 90

Step-by-step explanation:

Answer:yes its 15

Step-by-step explanation:

Step-by-step explanation:

area of parallelogram = length × height

780 = 26 × height

height = 780/26 = 30cm

The equation of the line that best describes the given table of ordered pair is y = x + 7

Equation of the line:

By using the slope and y intercept of the point, we can calculate the equation of the line as

y = mx + c

here m refers the slope and c refers the intercept.

Given,

Here we have the table of ordered pairs shows the coordinates of the two points on the graph of a line.

Now, we need to find the equation of the line that best suits this one.

In order to find the equation of the table, first we have to calculate the slope and the y intercept of the given table.

But in order to calculate the slope we need the points.

So, the point take has been taken by the table are

=> (-5, 2) and (0,7)

Now, the slope of the line is,

=> m = (0 - (-5))/ (7-2)

=> m = 5/5

=> m = 1

By looking into the point we have identified that the y intercept is 7,

Therefore, the equation of the line is

=> y = 1x + 7

=> y = x + 7

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Order of the tiles D, C, E, A

A square root of a number is a value of a number(other than the original number) that when multiplied by itself gives the original number. A square root of a number will be in the form of a².

Here are some examples of the square root of a number

√4 = 2 [ since 2 × 2 = 4 ]

√9 = 3 [ since 3 × 3 = 9 ]  

Here we have

1. √90 - √40

2. (√35 - √42) / (√5 - √6)

3. 2√27 - √48  

4. (√54 -√24)/√18 - √8  

Each problem can be solved as given below

1. √90 - √40

= √9 × 10 - √4 × 10  

= 3√10 - 2√10

= √10 = 3.16227

2.  (√35 - √42) / (√5 - √6)  

= (√5 × √7 - √7 × √6 ) / (√5 - √6)  

= √7 [√5 - √6 ] / (√5 - √6)  

= √7  = 2.64575

3. 2√27 - √48  

= 2√9×3 - √16×3

= 6 √3 - 4√3

= 2√3 =  3.46410

4. (√54 -√24)/√18 - √8  

= (√9×6 - √4×6)/√9×2 - √4×2 )

= (3√6 - 2√6)/3√2 - 2√2 )  

= (√6) / √2 )

= 1.73205

The resultant decimal numbers are

3.16227, 2.64575, 3.46410, and 1.73205.

And the order of the decimal numbers is

1.73205 < 2.64575 < 3.16227 < 3.46410

Therefore,

Order of the tiles D, C, E, A

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Answer:7/10

Step-by-step explanation:

The bicycles which the shop should build to minimize the average cost per bicycle is 25 bicycles

Average cost function:

This is a quadratic function, So

Average cost is minimum when

x = - b / 2a

= -(-0.1) / 2(0.2)

= 0.1 / 0.4

x = 1/4

Number of bicycles which should to minimize average cost per bicycle = minimum average cost × total cost

= 1/4 × 100

= 25 bicycles

Therefore, the number of bicycles which will minimize the average cost function is ,25 bicycles.

Complete question:

Aki's bicycle designs has determined that when x hundred bicycles are built, the average cost per bicycle is given by C(x)=0.2x^2-0.1x+3.799, where C(x) is in hundreds of dollars. How many bicycles should the shop build to minimize the average cost per bicycle?

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The expression we get after measuring prq is 5610x²+ 891x+33.

Given that,

p is 33, r is 17x+1 and q is 10x+1

We have to find the measure of prq.

Take the,

p is 33, r is 17x+1 and q is 10x+1

Now,

prq

By multiply we get an expression

Multiplying each term to each other.

(33)(17x+1) (10x+1)

1st multiply 33 to 17x+1

(561x+33) (10x+1)

Now multiply each 561x with 10x+1 and 33 with 10x+1

5610x²+ 561x+ 330x+33

Adding 561x and 330x

5610x²+ 891x+33

Therefore, The expression we get after measuring prq is 5610x²+ 891x+33.

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Answer:no

Step-by-step explanation:

No because 2 5's in x

Kala the trainer lasted 0.75 hours for each of the work out.

Let A represent plan A and B for plan B

On Wednesday there were 3 clients who did Plan A and 5 who did Plan B for a total of 6 hours. this is represented mathematically as

3A + 5B = 6 hours

On Thursday there were 9 clients who did Plan A and 7 who did Plan B for a total of 12 hours. this is represented mathematically as

9A + 7B = 12 hours

hence we have two system of equations with two unknown

9A + 7B = 12 hours

3A + 5B = 6 hours

solving the equation gives that A = B = 0.75 hours = 45 minutes

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By applying the exterior angle property, the measure of the exterior angle to ∠G in triangle EFG is equal to 120.7°

In Mathematics, the exterior angle property can be defined as a theorem which states that the measure of an exterior angle in a triangle is equal in magnitude to the sum of the measures of the two remote or opposite interior angles of that triangle.

In order to determine the value of ∠G in triangle EFG (ΔEFG), we would have to apply exterior angle property. Mathematically, the exterior angle property can be used to model triangle EFG (ΔEFG) and this is given by:

m<G = m<E + m<F

Substituting the given parameters into the formula, we have;

m<G = 84.3° + 36.4°.

m<G = 120.7°.

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