Answer:C
Step-by-step explanation:
I got it right so the answer is C.
Answer: 15 ft
Step-by-step explanation: shadow / height
8.4/6=1.4
21/1.4=15
Answer:
m ≤ - 10
Step-by-step explanation:
m/-5 ≥ 2
Multiply both sides by -5 to isolate m. Because we are multiplying by a negative, we must flip the sign.
m ≤ -10
As the ball hits the ground, its height will be equal to 0, so...
-3t² + 12t + 63 = 0
t² - 4t - 21 = 0
Using the Viet's theorem to solve the quadratic equation quicker:
t₁ + t₂ = 4
t₁t₂ = -21
t₁ = -3 - this is not possible because time can't be negative
t₂ = 7
That means, the ball is expected to hit the ground after 7 sec has passed.
