Please help!! What does a straight line slanting up from left to right on a distance versus time graph show?

Average time
Average distance
Constant speed
Changing speed

Please answer!

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

Jasmine is diving off a 3-meter springboard. her height in meters above the water when she is x meters horizontally from the end of the board is approximated by the equation h=-x^2+3x+3. what is the maximum height jasmine will reach on her dive?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.