21\4×1 3\5 i really need can anyone me plz.

Which expression is a perfect cube? a. x8 b. y24 c. m28 d. x64

The sum of a number and 5 times the number is 18.find the number

Find the radius of a circle that has a circumference of 16. the formula for the circumference of a circle is c = 2tr, where r is the radius and c is the circumference. the equation solved for r is r = c over 2π. r=4 r= 8 r=12 r= 16