Lisa purchased a hat for $10, a purse for $20, and a book for $23. the sales tax rate was 7.2 percent. what was the total amount she paid?

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.