Rectangle ABCD is transformed to A'B'C'D' by a dilation. What is the scale factor used for the dilation?

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Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?