(6x+7)∘ and (5x+8)∘ what does x represent

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

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders

Plot a point at the y-intercept of the following function on the provided graph. 3y=-5x+7 20 points