Dora spent $45 and has $32 left. which equation can be used to calculate how much money dora had at the beginning?

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?