Answer:
14. -53/89
15. 2 29/30
Step-by-step explanation:
Sum of
18/5+(-71/5)
=18/5-71/5
= 18-71/5
= -53/5
Difference between 18/5 and -71/5
=18/5-(-71/5)
=18/5+71/5
=18+71 /5
=89/5
Sum divided by difference
-53/5÷89/5
= -53/5×5/89
= -53/89
15.
1/2+1/3+1/5+x=4
15+10+6/30+x=4
31/30+x=4
31/30-4=x
31-120/30=x
89/30=x
2 29/30=x
