The high temperatures for the week were 87, 82, 100, 83, and 88. What is the mean of the temperatures without the outlier

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

Can someone tell me if this is perpendicular? !