What are two numbers that can be multiplied together to equal -30 but also the same two numbers add up to -5

When drawing a trend line for a series of data on a scatter plot, which of the following is true? a. there should be an equal number of data points on either side of the trend line. b. all the data points should lie on one side of the trend line. c. the trend line should not intersect any data point on the plot. d. the trend line must connect each data point on the plot.

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

Pls! does anybody know a shortcut for answering these types of questions in the future?