Erin and her friends launch a rocket from ground level vertically into the air with an initial velocity of 80 feet per second. The height of the rocket, h(t), after t seconds is given by
h(t) = -16t2 + 80t.
1. They want to find out how high they can expect the rocket to go and how long it will be in
the air
a. Use the coordinates for the vertex of the path of the rocket to find t, the number of
seconds the rocket will be in the air before it starts its downward path.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

8 2/3 is the answer

step-by-step explanation: just use a calculator

answer are

step-by-step explanation:

9

step-by-step explanation: