What are the coordinates of the focus and the equation of the directrix? a. focus: ; [-1/4, 0]; directrix: x = 1/4  b. focus: ; [1/4, 0]; directrix:   x  =  -1/4 c. focus: (–4,0); directrix:   x  = 4 d. focus: (4,0); directrix:   x  = –4

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Which of the following is an equation of a line parallel to the equation y=4x+1?

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?