Which of these is a unit rate?
1) $3 for 3 hot dogs
2) $8 for 6 cupcakes
3) $5 for a case of soda
4) $16 for 2 movie tickets

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

The sat and act tests use very different grading scales. the sat math scores follow a normal distribution with mean 518 and standard deviation of 118. the act math scores follow a normal distribution with mean 20.7 and standard deviation of 5. suppose regan scores a 754 on the math portion of the sat. how much would her sister veronica need to score on the math portion of the act to meet or beat regan's score?

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?