4. The height of a rocket launched upward from a 85-foot cliff is modeled by the function h(t) = -16t2 + 35t + 85, where his height in feet and t is time in seconds.
a) What is the maximum height of the rocket?
b) How long does it take for the rocket to reach the maximum height?
c) How long does it take the rocket to reach the ground at the bottom of the cliff?
In the 7ern Product Property to solve each equation.

Amodel rocket is launched from a roof into a large field. the path of the rocket can be modeled by the equation y = -0.04x^2 + 8.6x + 4.8, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. how far horizontally from its starting point will the rocket land? a. 0.56 m b. 215.56 m c. 431.11 m d. 215.74 m

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?

Tim open up a new saving account with a $50 deposit and plant to deposit $20 per week into the same account.write an expression to represent the total amount in his savings account.