Which relation is a function?

A.{ (-4,3), (-2,3), (-1,2), (2,5), (3,2) }

B. { (-4,1), (-2,3), (-2,1), (-1,5), (3,2) }

C. { (-4,1), (-2,3), (-1,2), (3,5), (3,2) }

D. { (-4,1), (-2,3), (-1,1), (-1,5), (3,2) }

Solve the following equations 2a+3=13 4b-2=22 5c+6=41 3d+4=16 7e-3=25 4f+7=15 9g-3=6 10h+4=44 16+2j=20 13-3k=10

A man wants to hike two trails. The length of one trail is 7.709 km. The length of the other trail is 9.0309 km. What is the total length of the two trails?

What dose 0.022222222 =

A4 paper: 4 packs for $4.20 or 10 packs for $9.50

Multiply the binomial (3x-2) (3x+2)

Jack is now seven times old as James. In 5 years, Jack will be five times as old James. How old is James now?

What is 0.325 as a fraction in simplest form?

Alfred is practicing typing. The first time he tested himself, he could type 27 words per minute. After practicing for a week, he could type 29 words per minute. After two weeks he could type 31 words per minute.

X+y=7 x-y=3 2x-3y=15 3x-2y=10

The area of a rectangular wall of a barn is 64 square feet. It's length is 12 feet longer than the width. Find the length and width of the wall of the barn