Marge purchased х
bicycle helmets and
y
tire pumps. Each helmet cost $15.00 and each pump cost $7.00. She purchased a total of
21 items and spent $219.00. How many helmets did Marge buy?

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Alogical argument that is presented in graphical form using boxes and arrows is called?

Need so much on this one how many yards?