That would be 5(3w + 13)
The GCF is 5
To get the reciprocal, simply flip the numerator and denominator. The reciprocal of 3/10 is 10/3.
To see how they are related, let us solve the two equations.
FIRST EQUATION



SECOND EQUATION



Hence the solutions to the two equations are ADDITIVE INVERSE of each other.
Divide 5 by 4 and the left over Is the top of the fraction then your divisor is on the bottom so it would be 1 and 4/5.