15 – 2b = -9
16 - r/7 = 21
5+3w=20
-18 = 9x -9
6a +6 = -18
7p-3=32
the * separate the questions i dont wanna fail this year but i do not understand

1. b = 12

2. r = -35

3. w = 5

4. x = -1

5. a = -4

6. p = 5

Step-by-step explanation:

1. First you need to subtract 15 from both of the sides, which would cancel out on one side and then the other side you would need to solve -9 - 15, which is -24. Then your equation should look like this: -2b = -24. Then all you need to do is divide both sides by -2 and you should get b = 12 as your final answer.

2. -r/7 is just -1/7r. So first you subtract both sides by 16; 21 - 16 is 5, so your equation should look like this: -1/7r = 21. You can't divide by a fraction, so you would multiply both sides by the reciprocal, which is -7/1. And 5 ×  -7 is -35. So your answer will be, r = -35

3. First subtract 5 from both sides, making your equation now look like: 3w = 15, since you subtracted 5 from 20. Then all you need to do is divide by sides by 3 and your answer should be, w = 5

4. So first you add both sides by 9, giving you: -9 = 9x, because -18 + 9 is -9. Then divide both sides by 9 and your answer should be, x = -1.

5. First you need to subtract 6 from both sides; -18 - 6 = -24. So your equation should be, 6a = -24. Then you divide both sides by 6 and you should get a = -4, as your final answer.

6. So first you add both sides by 3 and your equation should be: 7p = 35. Then divide by 7 and you should have p = 5, as your answer.

the volume is the product of the area of the base, 3x(3x+4), and the height, 3x-1

step-by-step explanation: