What is the characteristic of a Matrix Null

Select the appropriate response:

A) All elements are = 0

B) All elements are negative

C) First row = 0

D) First Column = 0

I think the answer is A)

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%

1jessica's home town is a mid-sized city experiencing a decline in population. the following graph models the estimated population if the decline continues at the same rate. select the most appropriate unit for the measure of time that the graph represents. a. years b. hours c. days d. weeks

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?