100 points! Need help! 1: At what point(s) do these graphs intersect?
y=x^2+4x+3
y=4x+12

Seth’s solution:
y=x^2+4x+3
y=4x+12
x^2+4x+3=4x+12
x^2-9=0
x^2=9
x=3
The graphs intersect at .
Is Seth’s solution correct? Explain.

2: A rocket is launched vertically from the ground with an initial velocity of 48 .
(a) Write a quadratic function that shows the height, in feet, of the rocket t seconds after it was launched.
(b) Graph on the coordinate plane.
(c) Use your graph from Part b to determine the rocket’s maximum height, the amount of time it took to reach its maximum height, and the amount of time it was in the air.