Find the equation of a circle with center at the origin and x intercepts 10 and -10

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.