If a football player passes a football from 4 feet off the ground with an initial velocity of 36 feet per second, how long will it take the football to hit the ground? use the equation h = -16t2 + 36t + 4.
a. quantity of 9 plus or minus square root of 65 all over 8
b. 9 plus or minus square root of 65 end root over 8
c. quantity of 9 plus or minus square root of 97 all over 8
d. 9 plus or minus square root of 97 end root over 8

D ) h₁,₂  =[ ( 9 ± √97 ) ]/8

Step-by-step explanation:

The equation of the football is

h =  -16t²  + 36t +4

What is the time for football to hit the ground

Hit the ground means     h = 0  then

-16t²  +  36t  +  4  =  0

Simplifying by (-4)

4t²  -  9t   - 1  =  0   a second degree equation

Solving

h₁,₂  =[ ( 9 ± √(81 + 16) ] /8        ⇒  h₁,₂  =[ ( 9 ± √97 ) ]/8

The answer given in  D

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