Is 3/10 of the visitors were adults and there were 100 visitors how many visitors were adults?

Consider the function f(x)=-5x+3 what is f(-2)

The scatterplot below shows the number of hours that students read weekly and the number of hours that they spend on chores weekly. which statement about the scatterplot is true?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a