C. 0.4 times 6 is 2.4. Hope that helps.
A^2 + b^2 = c^2
12^2 + 17^2 = 485
so c^2=485
so c=22.0 inches
I assume that you want the measurement of angle A
A + (A + 38) = 90
angle A + (38 more than angle a) = are complementary
2A = 52
A = 26
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144 inches. 12 feet in one hour
12 inches per feet
12feet x 12 inches per foot= 144 inches
81 is 45% of 180, all you do is divide 81 by .45 and boom there you go