Question

Please really need help on these two

Answer 1

Answer:

See below,please

Step-by-step explanation:

Question 1

Because we know

$b = \pi {r}^{2} + c$

So,

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

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

$r = + or - \sqrt{ \frac{b - c}{\pi} }$

Hence, the last choice is the right answer.

Question 2

Because we know

$d = \sqrt{ \frac{h}{6.752} }$

So,

$\frac{h}{6.752} = {d}^{2}$

$h = 6.752 \times {d}^{2}$

Hence, the First choice is the right answer.