Answer:
8a + 9b and 16a - 10b
Step-by-step explanation:

The diameter of Jupiter is about 40 times the diameter of Earth's moon.
Answer: 5 seconds
<u>Step-by-step explanation:</u>
Maximum height is the y-value of the vertex. The number of seconds at maximum height is the x-value (aka axis of symmetry).
h(x) = -2x² + 20x + 48
a=-2 b=20 c=48
Axis of symmetry: x = 
= 
= 
= 5