Why can a variable be used to represent a number

Bobby goes to one store and finds a Christmas tree for $49.99. The store is having a 20% off sale. Bobby decides to go across the street to another store and finds the same tree for $54.99. This store is having a 25% off sale.

Aslina was paid $2 for every bracelet she sold. For every 10 bracelets sold, she was given a bonus of $5. How many bracelets did she sell if she received $189?

Line perpendicular to y=2/3+3 and passes through 2,1

What is the simplist form for 16/60

Charlotte and her friends decided to have a water balloon fight! They got 20 water balloons and used 6 liters of water to fill them all equally. How much water was in each balloon? Write your answer as a proper fraction or mixed number. liters

Find the unit cost of a store sells a dozen eggs for 1.99.

Solve the equation. If necessary, round your answer to the nearest tenth. 4 = 121 A. 2.75, - 2.75 B. 5.5, - 5.5 C. 11, - 11 D. 30.25, - 30.25

After 56 cans of soup were sold, a clerk moved the remaining cans to a display case. The display case had shelves that could each hold 9 cans. How many shelves were needed to fit all the remaining cans?

Mia did this problem 1336 of 1/8 is 3/6 what did Mia get wrong?

1 By what factor is the volume of a right square pyramid multiplied if its height is multiplied by 8 but the dimensions of its base are unchanged? A. 1/16 B. 1/8 C. 4 D.