Question

Help meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Answer 1

Answer: 2.5, 5.3

Explanation:

We can substitute 217 into this function and solve.

Given:

`s(t)=-16t^2+126t`

Substitute:

`\displaystyle 217=-16t^2+126t`

Subtract 217 from both sides of the equation:

`\displaystyle 0=-16t^2+126t-217`

Quadradic formula:

`\displaystyle x=(-b\pm√(b^2-4ac) )/(2a),\;\;\displaystyle x=(-(126)\pm√((126)^2-4(-16)(-217)) )/(2(-16))`

Solve:

x ≈ 2.5 and 5.3

We can also graph, see attached.