Plz asap 15 pts
which of the following tables represents a function?

x 4 4 9 9
y 2 −2 3 −3

x 2 −2 3 −3
y 4 4 9 −9

x 1 −1 1 −1
y 4 5 6 7

x 5 5 6 6
y 1 2 3 4

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. 4x^2 + 20x + 25 = 0

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?