Find the length of df or state what additional information you need to find it

Find the equation of the trend line (line of best fit). show your work i'm using the points (34,76) (42,91)

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

Ze trinomial x2 + bx – c has factors of (x + m)(x – n), where m, n, and b are positive. what is ze relationship between the values of m and n? explain how you got ze answer