About how many times as great as a teller's salary is a professor's salary ?

Step-by-step explanation:

Actually, we're comparing a professor's salary to a teller's:

$70,000

= 2.8

$25,000

Obviously the prof earns more than the teller, 2.8 times more, to be exact.

Stated differently, the teller's salary is 35.71% of the professors:

$25,000

= 0.3571

$70,000

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80