Answer:
t = 4
Step-by-step explanation:
Given that:

When h(t) = 80, we have that:

t = 0 represents when the ball has not been thrown at all, in its initial position.
t = 4 represents the time taken for the ball to hit the roof of the building on its way down.
Hence, our answer is t = 4. (t is in secs)
Answer:
2.71
Step-by-step explanation:
-(1.46) +(_3.82)+7.99= -1.46-3.82+7.99
2.71
Answer:
thats right
Step-by-step explanation:
Greetings!
You can solve this with a simple equation:
Take the letter x to be the unknown number:
20 = 8+ (X + 5)
Then you can move the 8 + to the opposite side making it a negative 8:
20-8 = X + 5
12 = X + 5
Move the +5 over to the other side, making it a negative 5:
12 - 5 = x
7 = x
So the value of x is 7.
Hope this helps!