Question

A water fountain jet shoots short spurts of water over a walkway. The water spurts reach a maximum height, then come down into a pond of water on the other side of the walkway. The height above the jet, h, of a spurt of water t seconds after leaving the jet can be found by the function h(t)=-16t^2+36t. find the time it takes for the spurt of water to return to the jet's height; tthat is, when h(t)=0..

The supurt of water returns ____ seconds after tthe shot.. (type a integer or decimal number)

Answer 1

g

Answer 2

\[-16t^{2} +36t = 0\]
Factor out a "4t"
\[4t(-4t + 9) = 0\]
\[4t = 0 --> t=0\]
\[-4t+9=0 --> t = \frac{9}{4}\]

Answer 3

so what's the answer

Answer 4

?

Answer 5

well i set h(t)=0 to see when the water its the ground
then i solved for t (time)

what are they asking you to solve for?
answer is right there in front of you?

Answer 6

There asking me to find the spurt of water returns ___ seconds after the shot.

Answer 7

i typed 9/4 in as the answer and it said it was wrong?

Answer 8

no 9/4 is correct, if you plug it in to the equation you get a height of 0

just cause the computer says it wrong doesn't always mean its incorrect
most likely, the "correct" answer is not simplified or in the form that they want

Answer 9

so how could i simplify that fraction?

Answer 10

could it be 2.25?

Answer 11

hmm you can change it to a mixed number or a decimal

yes 9/4 = 2.25

Answer 12

that worked... YOU ARE GREAT!!!!

Answer 13

i believe the instructions say to write answer as an integer or decimal :)

Answer 14

I'm going to post another one will u help me?

Answer 15

sure...but check your answer first , just cause someone posts an answer, don;t blindly submit it