PLEASE HELP!!

7) A firework is shot into the air from an initial height of 6 feet. The height in feet of the firework above the ground is given by s(t)=-15t^2+52t+6, where t is time, in seconds, and t0, At what time will the firework be 45 feet off the ground?

8) What is the solution to the system of equations represented by the graph below?

https://lh3.googleusercontent.com/4XIbkLUtYJQvNp_1ljdnP_t-zC_OFt6cEPhtJkun3vMbrh3GpVIm4Bh-F_zlPyRw2JaXKkRtXw=w231

A)(-2,0) and (2,0)

B)(-2,0), (2,0) and -.5

C)(-1.5, 2) and (3.5,7.5)

D)(-1.5, 2) and (3.5,-7.5)

9)If a parabola has an axis of symmetry at x=3, a maximum height of 7 and passes through the point (5,-2), write an equation of the parabola in vertex form.

10) https://lh3.googleusercontent.com/BFKmj7XTLhbV1i80VTsLA4B2GVOjQCCosf-pTUuk5jsU8Tj9xHyjp_hHSqtofukYuo55E8Q_Ew=w396