What function has an inverse that is also a function

What is the slope of a line that is perpendicular to the line of 2x+4y=12

Eric has two dogs. He feeds each dog 250 grams of dry food each, twice a day. If he buys a 10-kilogram bag of dry food, how many days will the bag last

Y = 5x + 2 4x - y = 0 Is (2,12) a solution of the system?

Imagine a friend ask to borrow $100 and agrees to pay you back in one month. You agree and in one month pays you back. Do you lose money

The temperature at 6 PM was 72°. This temperature was 8° less than at 4 PM. The temperature at 10 AM was 5° greater than the 4 PM temperature. What was the temperature at 10 AM?

3t minus 7 equals 5t then 6t =

Which is the same as dividing 35 by 6? a. Taking 1/6 of 35 b. Taking 1/35 of 6 c. 5 1/5 d. 6/35

The measure of an angle is 7°. What is the measure of a supplementary angle?

A bakery sells a box of 12 cookies for $10.50 and charges $0.24 for each additional cookie. If Marshall has $20.00 to buy the box of cookies and additional cookies, what is the maximum number of additional cookies he can buy?

20% tip on a bill of 39.27