Answer:
C
Step-by-step explanation:
Hello There!
so
y = -5x^2 + 8x +4
where y = height of ball and x = seconds after ball was thrown
The plus 4 is the y intercept and because y equals height of ball the 4 would represent the height that the ball was thrown at
<em>~TheMathWiz</em>
The answer is on google no dumb stuff dummy
Greetings!Simplify the Expression.
Distribute the Parenthesis.
<em>How?</em><span> Multiply the terms inside the Parenthesis by the term outside of the Parenthesis.
</span>
Combine Like Terms.

The Answer Is:
![\left[\begin{array}{ccc}17\end{array}\right]](https://tex.z-dn.net/?f=%20%20%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D17%5Cend%7Barray%7D%5Cright%5D%20)
Hope this helps.
-Benjamin
Answer:20.571
Step-by-step explanation:
x:y = 21: 24=7:8
8x=7y
y=8x/7
When x=18
y=8*18/7
y=20.571