20% of what equals 100 how would i show my work

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

What power can you write to represent the volume of the cube shown? write the power as an expression with a base and an exponent and then find the volume of the cube