Question

Please really need help on these two

Answer 1

Answer:

1.  d   (last option)

2.  a   (first option)

Step-by-step 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 $\pi$ :

$\implies r^2=\dfrac{b-c}{\pi}$

Square root both sides:

$\implies r=\pm\sqrt{\dfrac{b-c}{\pi}}$

Question 2

Rewrite $d=\sqrt{\dfrac{h}{6.752}}$ to make h the subject.

Square both sides:

$\implies d^2=\dfrac{h}{6.752}$

Multiply both sides by 6.752:

$\implies h=6.752d^2$