carlos teaches guitar lessons at guitar shack. he charged a one time registration fee of $10 and each lesson costs $20. he keeps all the money he collects. what is the rate of change?

The price of a notebook has risen to $3.75 today. Yesterday's price was $3.50 . Find the percentage increase. Round your answer to the nearest tenth of a percent.

The mayor of a large city claims that the average net worth of families living in this city is at most $300,000. A random sample of 25 families selected from this city produced a mean net worth $288,000.

Solve the proportion. 2/10 = 11 / x. a. 55 b. 1.8 c. 2.2 d. 110

Clark is removing dirt from a rectangular section of his backyard to build a water feature. The section is 2.4 meters long and has an area of 8.88 square meters. 2.4x = 8.88 What is the width of the section of Clark's backyard? A. 3.7 meters B. 4.

Simplify the expression - 3a+5 (a-1) - 7 and then evaluate the solution to part b if a = - 5

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.