9. write the equation in standard form: 25x2 –16y2 = 400

Question 101 points)which equation in slope-intercept form represents the line that passes through (5, 1) and(-4,7)

What is the area of the trapezoid shown ?

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%