Answer:
0.0000000316 = 3.16×10^-8
0.000008304 = 8.304×10^-6
Since 1 foot equals to 12 inches, it can be written as 1/12. We just have to multiply both the numerator and denominator by 5. If we do this, then the answer will be 5/60. So, in five feet, there are 60 inches.
Hope it helps :)
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The answer is c ) 15 cm
a = (h×b)/2
a= (15×20)/2
a= 300/2
a= 150 cm²