Solve 2a + 21 = 8a - 9, step by step

Answers

Answer 1

Answer: 2a + 21 = 8a - 9

Combine like terms.

2a + 21 = 8a - 9
-2a -2a

21 = 6a - 9
+9 +9

30 = 6a
6a/6 = 30/6
a = 5

Answer: a = 5

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A pretzel has a mass of 5 grams. What is its mass in milligrams? (1,000 milligrams = 1 gram) A. 0.5 milligram
B. 50 milligrams
C. 5,000 milligrams
D. 500 milligrams

Answers

The answer would be c.

The answer is c. Let me know if I'm right.

Is y = 1 a solution to the equation 5 + 3y = 8?

Answers

Yes. It is a solution

Yes, because 3 times 1 is 3, and 3 plus 5 is 8. 8 is equal to 8. So yes. y=1 is a correct solution to the equation.

A 1-day movie rental at red box costs $1.39. For each additional day there is a fee of $0.50. How much will it cost to rent a movie for 7 days?

Answers

It will cost a total amount of $4.89 to rent a movie for 7 days

Word Problem

Given Data

Cost per day = $1.39

Fee per additional day = $0.50

Number of added days = 7

Let us find the mathematical expression for the above question

Total Cost = 1.39+ 0.5*7

Total cost = 1.39+ 3.5

Total cost = $4.89

Learn more about Word Problem here:

brainly.com/question/25693822

Lets just simply solve:-

Days:- 1 2 3 4 5 6 7
1.39 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 = Cost to rent a movie for 7 days.

1.39 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 + 0.50 = 4.39

So, to rent a movie for 7 days it would cost $4.39.

Hope i helped ya!!

calculate the volume of a cylinder whose height is (2x-5) inches and whose base has a radius of (x-5) inches round your answer to the nearest tenth of a cubic inch

Answers

v=(1/3)hpir^2
aprox pi to 3.14 fo this problem
v=(1/3)(2x-5)(3.14)(x-5)^2
v=(1/3)(2x-5)(3.14)(x^2-10x+25)
v=(1/3)(3.14)(2x^3-25x^2+100x-125)
v=(1/3)( $6.28x^(3)-78.5x^(2)+314x-392.5$ )
v= $(6.28x^(3)-78.5x^(2)+314x-392.5)/(3)$
and since we don't know what x,height, or radius or diameter or surface area or anything about the cylinder, we can't solve

Find the missing dimension. Round your answer to the nearest tenth. Please help me answer this problem. :) thanks.

Answers

The right answer for the question that is being asked and shown above is that:

This can be answered using the Pythagorean Theorem.
h2 = a2 + b2
h = square root (8^2 + 5^2)
h = square root (64 + 25)
h = square root (89) in
h = 9.4 in

So the correct answer is 9.4 in given the dimension 5 inches and 8 inches.

Bobbys car uses 6l every 1km how many does he use in 42km

Answers

6 * 42 = 252 liters

6 times 42 = 252 l used for 42 km. So he used 252

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