1. The height of a pop fly ball over the time after the ball is hit is modeled by the
function, h(t) = -16t2 + 81t + 5, where h is the ball's height in feet above the
ground and t is the time in seconds after the ball is hit. Use the quadratic formula to
find how many seconds it takes for the ball to hit the ground.

5.12 seconds to the nearest hundredth.

Step-by-step explanation:

When the ball hits the ground h = 0 so

-16t^2 + 81t + 5 = 0

t =  [ -81 +/- sqrt ((81^2 - 4 * -16 * 5)]/ (2*-16)

=  (-81 +/- sqrt 6881) / -32

= 5.12 , -0.6

So the answer is 5.123 seconds.

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step-by-step explanation:

rick has $1400 and sally has $1500

step-by-step explanation:

to find amount of money rick has after 10 years :

principal = $1000 , time = 10 years , rate = 4% annually

to find amount of money sally has after 10 years :

her friend gives to pay her $50 per year, therefore money she has after 10 years = 50 × 10 = $500

also, sally gets $1000 after 10 years,

therefore, total amount of money sally has after 10 years = 500 + 1000 = $1500

so, after 10 years : rick has $1400 and sally has $1500