I will give Brainiest Answer for whoever helps me!!
I need help adding and subtracting in Scientific Notation... (the ^ means the power)
1. (6 x 10^1) + (9 x 10^1)
2. (7 x 10^0) + (3 x 10^1)
3. (8.8 x 10^2) + ( 3 x 10^2)

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

41/17 as a decimal rounded to the nearest hundredth

Estimate the area under the curve f(x) = 16 - x^2 from x = 0 to x = 3 by using three inscribed (under the curve) rectangles. answer to the nearest integer.