Which of the tables represents a function?

table a
input output
4 3
3 2
3 1
table b
input output
1 3
3 5
5 7
table c
input output
0 0
1 4
1 5
table d
input output
4 1
4 2
4 3

table a
table b
table c
table d

Ten times the square of a non-zero number is eqaul to ninety times the number

Given: prst square pmkd is a square pr = a, pd = a find the area of pmct.

Mallory has been offers two different jobs. she can baby sit for 6 hours a week and get $8.50 an hour. or she can work at the library for 14 hours a week and make $5.50 an hour. which job will allow her to save the most money after 6weeks?