Answer
a $5x-25$
b $2(x+3)$
c $\frac{39}{2x}$
Work Step by Step
Use x for the unknown number
a The product of 5 and a number, decreased by 25
$5x-25$
b Twice the sum of a number and 3
sum of a number and 3 $(x+3)$
twice the sum $2(x+3)$
c The quotient of 39 and twice a number
twice a number $2x$
The quotient of 39 and twice a number $\frac{39}{2x}$
