Question

help please:(
picture posted below

Answer 1

Set the equation equal to 50 and solve for t. I am gonna guess that quadratic formula will be used. :)

Answer 2

can u help me?

Answer 3

Sure.

We have the equation for height above ground as,

\(s(t)=-16t^2+70t+3\)

We want to know at what time will \(s(t)=50\).

So we simply set it equal to 50 and solve for t.

\(50=-16t^2+70t+3\)

We will want to subtract 50 from both sides.

\(-16t^2+70t-47=0\)

Now do you think you could solve it from there?

Answer 4

im not sure.. what do u do with the t's?

Answer 5

You solve for them :P

Answer 6

lol how?

Answer 7

Are you familiar with the quadratic formula?

Answer 8

no

Answer 9

can u please help me?

Answer 10

The quadratic formula is,

\(\displaystyle t=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\)

Where,

\(0=-at^2+bt-c\)

Answer 11

sooo.. what would the answer be?

Answer 12

@austinL ?