please answer both

Write each of the following numbers to 3 significant figures in non-exponential notation. (Do not include a decimal point for numbers greater than 1.) 8.501036.151047.051034.57105 Consider the following operations on the number 8.39102 Without using a calculator, decide which would give a significantly smaller value than 8.39102, which would give a significantly larger value, or which would give essentially the same value. 8.39102+4.951028.391024.951028.391024.951028.391024.95102