Ineed to answer this before 11: 59pm est, today , i would appreciate your .
an object is thrown upward at a speed of 58 feet per second by a machine from a height of 7 feet off the ground. the height h of the object after t seconds can be found using the equation h=−16t^2+58t+7
when will the height be 17 feet?
when will the object reach the ground?

0.18 sec or 3.4 sec.

For second part, it will take 3.7 sec.

First part:

Set h(t) = 17and solve for t.

-16t²+ 58t + 7= 17

-16t² + 58t - 10 = 0

Solve this quadratic equation for t. You should get 2 positive solutions. The lower value is the time to reach 17 on the way up, and the higher value is the time to reach 17 again, on the way down.

Second part:

Set h(t) = 0 and solve the resulting quadratic equation for t. You should get a negative solution (which you can discard), and a positive solution. The latter is your answer.

Step-by-step explanation:

three-fifths of a number means multiply three-fifths by a variable

increased by 10 means addition +10

together it is