Formula for mean wait time

Part 1: Writing Expressions Write an expression that looks like Sarah's expression: 5 (2j + 3 + j). Replace the coefficients so that your expression is not equivalent. You may use any number that you choose to replace the coefficients.

a music streaming service charges a $20 membership fee each month. the streaming service charges $1.50 for every song that you download. how many songs did you download if you paid $45.50 in one month?

How much is 33 1/3% of $4000?

4x + 2y = 8? what is the graph to this

1L is the same as cubic what?

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.