The function is symmetric in the line that goes trough the top. The top is on t=2.5 seconds. If you want to know on which time the height is equal to 15 feet, you draw a line on that height in the graph and see where it crosses. That is at t=1.25 and t=3.75
What do you have to estimate?
The first step for solving this equation is to determine the defined range.

, z ≠ 0
Move the expression

to the left side of the equation and change its sign.

-

=

Now we need to write all numerators above the least common denominator of 8z. This will change the equation to the following:

=

Simplify the equation using cross multiplication.
8 = -56z
Switch the sides of the equation.
-56z = 8
Divide both sides of the equation by -56.

, z ≠ 0
Lastly,, check if the solution is in the defined range to get your final answer.

Let me know if you have any further questions.
:)
.6 * 25 = 15
.06 * 25 = 1.5
Answer:C. 2x2 + 3x − 1 is quadratic
Step-by-step explanation:
Quadratic expressions are polynomial expressions in which the highest power of the variable is 2.
Looking at option A, the highest power of the variable in the polynomial is 4. Therefore, it is not a quadratic expression.
Looking at option B, the highest power of the variable in the polynomial is 3. Therefore, it is not a quadratic expression.
Looking at option C, the highest power of the variable in the polynomial is 2. Therefore, it is a quadratic expression.
Looking at option D, the highest power of the variable in the polynomial is 1. Therefore, it is not a quadratic expression.