what is the average rate of change from 1 to 3 of the function represented by the graph? the graph is attached.

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

Find the domain and range of the following function f(x) = 51x - 21+ 4

Plz ( true - false) all triangles have interior angles whose measure sum to 90.