how does the decimal piont move whenever you rewrite a percent as a decimal and when you rewrite the decimal as a percent?

Interpret the following expression (5y^2-7)^3/(2y)^2

Suppose that circtes a and b have a central angle measuring 100. additionally, the measure of the sector for circle a is 10 m2 and for circle b is 40 m2 if the radius of circle a is 6 m, what is the radius of circle b?

Two similar figures have sides in the ratio of 2: 3. if a side of the smaller triangle has a length of 7, what is the length of the corresponding side of the other triangle? 4 10 14 21