In the formula for average rate of change, what does the triangle in front of the x and y stand for?

Proceed as in example 3 in section 6.1 to rewrite the given expression using a single power series whose general term involves xk. ∞ n(n − 1)cnxn − 2 n = 2 − 4 ∞ ncnxn n = 1 + ∞ cnxn n = 0

What is the equation of a line passing through the point (6,1) and parallel to the line whose equation 3x=2y+4

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?