Please help me out! its urgent:(

for the third problem a = cb

for the 4th problem x = 5a + g

for the 2nd problem p = (q - 3r) / 4

for the first problem x = (-9 - z) / y

for the last problem: b = 15

A = 1/2 bh

75 = 1/2 b(10)

75 = 1/2 10b

multiply both sides by 2

150 = 10b

divide by 10 from both sides

15 = b

b = 15

use formula for the circle a=3.14

step-by-step explanation:

sure i'm up for it

step-by-step explanation: