Answer:
the answer is B. 75
Step-by-step explanation:
Answer:
Approximately 7.16 in
Step-by-step explanation:
Hi there!
Area of a circle equation:
where r is the radius
Plug in the given area 161 in.²

Divide both sides by π to isolate r²

Take the square root of both sides to isolate r

Therefore, the radius of the circle is approximately 7.16 in.
I hope this helps!
1. h₀ = 70
v₀ = 0 since the rock is dropped it has no initial velocity
when the rock hits the ground the height = 0
plug into the formula
0 = -4.9t² + 0(t) + 70
0 = -4.9t² + 70
Add 4.9t² to both sides
4.9t² = 70
Divide both sides by 4.9
t² = 14.2857142857
Take the square root of both sides
t = 3.7796447301
t ≈ 3.8 seconds
I am not doing the rest I only did one just to help you understand a bit more