William has a lemonade stand. It costs him $0.30 to make 3 cups of lemonade. Which of the following represents the rate of change of his cost with respect to the dozens of cups of lemonade he makes?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

What is always true about a positive integer raised to a negative odd power?

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?