hello :
by applying the distributive property :
6 × 4.3 = 6 × ( 4 + 0.3 )
= (6 × 4) + (6 × 0.3)
= 24 + 1.8
6 × 4.3 = 25.8
x is the total time in minutes for the free response
you are given number of questions as 15 - m and time per item as 8 minutes
to find x multiply the two givens together:
x = 8 * (15-m) = 8(15-m)