I need help with this math quiz ASAP!

#3: A
1/2bh
1/2(12)(5)
30
#4: C
bh
(11)(12)
132
#5: B
A=bh
525=15h
525/15=h
35
#6: C
bh
(25)(19)
475

#7: A
A=LxW
1450=50xW
1450/50=W
29=W
#8: D
I broke it into to 2 squares and added them together
(4.0x13.0)+(4.0x10)
52+40
92
#9: B
Same with this problem
(9x4)+(6x2)
36+12
48
#10: B
(6x8)+1/2(10x5)
48+25
73

Think of it as five or above give it a shove. change the 5 or above to the right to a zero and add one to the number on the left.