[Pre-calc]What is a point on each of the following lines: (a) r = (3,4) + t(2,1)
(b) x = 1 + 2t, y = 3 - 7t
(c) r = (4, 1 + 2T)
(d) x = -5t, y = 6

The perimeter of a square is80-64y units. which expression can be used to show the side length of one side of the square?

Acircle has a circumference of 2 pi cm. which statement about the circumference and area is true? a comparison of the area and circumference is not possible since the area cannot be determined. the numerical values of the circumference and area of the circle are equal. the numerical value of the circumference is greater than the numerical value of the area. the numerical value of the circumference is less than the numerical value of the area.

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%