natalie earns $2.50 for each cd she sells and $3.50 for each dvd she sells. natalie sold 45 dvds last year. she earned a total of $780 last year selling cds and dvds.write an equation that can be used to determine the number of cds [c] natalie sold last year.how many cd's did natalie sell last year?

A=1/2h(b1+b2) is the formula for the area of a a trapezoid b regular polygon c triangle d rhombus or kite

Which expression is equivalent to sq-80

Hii1977 cleaner shrimp are a species of shrimp that clean parasites from other organisms. fish allow the shrimp to eat the parasites in their mouth. the shrimp get a source of nutrition. the relationship between the shrimp and the fish is this association indicates that for the smaill aneser arecommensal,mutualistic,or parasitic for the begger one the anser are the shrimp and fish benefit each other , the shrimp harm the fish, or the fish do not benetit from the shrimp