Find s15 for the series -1 + -3 + -5 + -7 +
i am unsure of the formula to answer this equation. could someone give me a quick refresher. i do not want the answer, just the information necessary to find the answer myself. you!

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

When is g(x) = 0 for the function g(x) = 5.23x + 4?

(05.02) mr. morris is going to save money and replace his sailboat's mainsail himself. he must determine the area of the mainsail in order to buy the correct amount of material. calculate the area of the parallelogram to determine how much material should be purchased. be sure to explain how to decompose this shape into rectangles and triangles. describe their dimensions and show your work.