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Answer:
193.8
Step-by-step explanation:
a = 3.8 times 10^13 = 38,000,000,000,000
b = 5.1 times 10^-12 = 0.0000000000051
a times b = 193.8
3f
f+f+f=3f
since every f has the same value
example
2+2+2=3(2)
6=6