Which variable expression represents the word phrase? the sum of 12 and the quotient of 9 and a number

12−9y

12−(9÷y)

9 + (12 ÷ y)

12 + (9 ÷ y)

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Tan198=asin164=? how to solve this? ?

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.