Which relations are functions? A

x

y

-2

-4

-2 -6

0

-8

2

-10

B

x

y

0

4

10 5

20

6

10

7

C

x

y

2

-10

1 -20

0

-10

-1

-20

D

x

y

2.5

0

3.5 4

4.5

8

6.5

12

E

x

y

-10

4

-20 5

0

6

-10

7

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

The parabola opens: y=√x-4 (principal square root) up down right left

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !