Answer:
Part A: 8.547x10^(13)
Part B: 78.62x10^ (5)
Explanation:
Part A: 2.31x10^(5) x 3.7x10^(8)
(2.31)x(3.7)= 8.547
10^(5) + 10^(8)= 10^(13)
Final answer= 8.547x10^(13)
Part B: the exponents must be the same in order to add or subtract
2.31x10^(5) and 3.7x10^(8)
change 3.7x10^(8) to have the same exponent, so move the decimal 3 places to the right to give you 3700x10^(5)
Now add: 3700+3700+2.31+2.31= 78.62
since 2.31 has two decimal places, 78.62 has to have to decimal places that is why there is a decimal point between the 8 and 6
So the final answer is 78.62x10^(5)