Choice 1. None of these
Choice 2. Find the dollar amount of the tax, then .... blah
Choice 3. Neither of these
Choice 4. Find the percent of the original price jack has to .... yeah
Sorry, if you need explanations feel free to message me! I just didn't want anyone to feel ignored!
Also who writes these problems and how high are they
Answer:
here is the answer
FART.....
Step-by-step explanation:
Answer:

Step-by-step explanation:
Please see attached picture for full solution.
Step-by-step explanation:


Answer:
The time it takes for the cannonball to hit the ground is 6.49 seconds.
Step-by-step explanation:
You know that the height of the cannonball above the ground, h, in meters, in time, t, in seconds, is found by the function h(t) = -4.9t² + 30.5t + 8.4. You want to calculate the time it takes for the cannonball to hit the ground, that is, the time it takes for the bullet to reach zero height. So, being h(t) = 0 you have:
0 = -4.9t² + 30.5t + 8.4
To solve a quadratic function 0=a*x² + b*x +c, the expression is applied:

In this case, being a = -4.9, b =30.5 and c =8.4 you have:

Solving you get:
t1= -0.26 seconds and t2=6.49 seconds
Since time does not have a negative value, then <u><em>the time it takes for the cannonball to hit the ground is 6.49 seconds.</em></u>