57-8=49
So then 7y=49
Y=1 so 2y=2
It’s C. divide the diameter by 2 which is 12.2. then it’s pi • r^2. so 3.14 • 12.2^2 =467.36
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
2.4 x 10^11 / 8 x 10^9
= (2.4 / 8) x 10^(11 - 9)
= 0.3 x 10^2
= 30
Answer
30