Help me please
Which of the following relations is a function?

A.

(3, 4), (-4, 6), (3, 3), (-8, 2)

B.

(3, 0), (-4, 3), (8, 1), (-4, 5)

C.

(8, 1), (-4, 4), (3, 1), (8, 2)

D.

(3, 4), (-4, 2), (8, 1), (-8, 2)

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

What is the graph of the absolute value equation ? y=|x|-5