Iwill give brainliest and 5 star for correct answer!

which shows the expression below simplified?
(8.7 x 10^-2) - (1.1 x 10^-4

a. 8.59 x 10^-3
b. 8.689 x 10^-2
c. 8.59 x 10^-2
d. 8.689 x 10^-3

Write the fraction or mixed number and the decimal shown by the model

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%

The length of the line segment joining the midpoints of sides ab and bc of the parallelogram abcd is 10. find the length of diagnol ac