Question

Please really need help on these two

Answer 1

1. d (last option)

2. a (first option)

Explanation:

Question 1

Rewrite
`b=\pi r^2+c` to make r the subject.

Subtract c from both sides:

`\implies b-c=\pi r^2`

Divide both sides by
`\pi` :

`\implies r^2=(b-c)/(\pi)`

Square root both sides:

`\implies r=\pm\sqrt{(b-c)/(\pi)}`

Question 2

Rewrite
`d=\sqrt{(h)/(6.752)}` to make h the subject.

Square both sides:

`\implies d^2=(h)/(6.752)`

Multiply both sides by 6.752:

`\implies h=6.752d^2`