Devaughn's age is two times Sydney's age. The sum of their ages is 18. What is Sydney's age?

How many zeros does the function f(x)=4x3-x2+1 have

What is sin 7x/4 ? i need on this urgent trig

(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.