A line that passes through (1,8) and is perpendicular to the graph of y=2x+1. What equation represents the line in slope-intercept form?

Question and answers are in the attached picture. you so much in advance.

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

On the first of each month, shelly runs a 5k race. she keeps track of her times to track her progress. her time in minutes is recorded in the table: jan 40.55 july 35.38 feb 41.51 aug 37.48 mar 42.01 sept 40.87 apr 38.76 oct 48.32 may 36.32 nov 41.59 june 34.28 dec 42.71 determine the difference between the mean of the data, including the outlier and excluding the outlier. round to the hundredths place. 39.98 39.22 0.76 1.21