Ruth spent 12 minutes on the phone while routing 4 phone calls. In all, how many phone calls does Ruth have to route to spend a total of 18 minutes on the phone? Assume the relationship is directly proportional.

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

To which set of numbers does the number –5 belong? select all that apply. integers natural numbers rational numbers real numbers whole numbers

For what values of x is x2 + 2x = 24 true?