What are the next four numbers in the pattern below? 3, 9, 7, 11, 17, 15, a. 13, 19, 17, 23 b. 13, 11, 17, 23 c. 21, 23, 17, 23 d. 21, 19, 25, 25

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Simplify (4x^2 - 8xy + 2y^2) - (9x^2 - 4xy - 7y^2) a. -5x^2 + 4xy + 9y^2 b. -5x^2 - 4xy + 9y^2 c. -5x^2 + 12xy + 4y^2 d. -5x^2 - 4xy - 5y^2