What is the slope of the line that contains the points (-1, 9) and (5, 21)?

What is the common difference in the following arithmetic sequence? 7,3,-1,-5

The graph is supposed to show f(x) = 3 sin (x/4+1) - 1/2. which of the following are correctly represented in the graph? select two of the following that apply.

The length of a rectangle plus its width is 24 cm. the area is 143 square cm. what are the length and width of the rectangle?