Exponential functions

A shopkeeper sold a total of 15 boxes of pencild on monday snd tuesday. He sold 3 more boxes on monday than on tuesday. There were 12 pencild in each box. How many pencild did he sell on monday?

Last month, Margo bought a tree that grows 2.5cm each day. It was 5cm tall when she bought it and now it is 65cm tall. Write an equation to determine the number of days (d) Margo has owned the plant. Find the number of days Margo has owned the plant.

Which equation represents exponential decay? a. f (x) = 8xb. f (x) =.08xc. f (x) = 2 (4x) d. f (x) = 10 (2x)

Solve for x: 2 (x-4) = 4x+28

Ella simplifies (4b+4r) + (-2b-r) and says the result is b + 5r. What error did Ella make?

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.