Only the first 2 pages i need explaination on 8, 7, 10, 11, 14,13

Remember

area of paralellogram is height times legnth of base
7.
height=18.7
legnth of base=6
area=18.7*6=112.2 yd^2

8.
height=5
leggnth of base=6
aera=5*6=30 m^2

10.
flip on side
height=7
legnth of base=15.1
area=7 times 15.1=105.7 ft^2

11.
height=10.2
legnth of base=14.2
area=14.2 times 10.2=144.84 cm^2

13.
height=18
legnth of base=19
area=18*19=342 in^2

14.
height=18
legnth of base=18
area=18*18=324 mi^2