Find the center and the radius of the circle with the equation: x^2-2x y^2 4y 1=0
a. center: (1, 2) radius: 4
b. center: (2, -4) radius: 1
c. center: (1, 2) radius: 2
d. center: (1, -2) radius: 2

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

The measures of the angles in △abc are given by the expressions in the table. angle measure angle a 65° angle b (3x−10)° angle c (2x)∘ find the value of x. then find the m∠b and m∠c.

Jackson earns $25 per hour as a tutor at the college library. he set a weekly spending budget of $130 each week and puts the remaining money in his savings account. how many hours must he work this week to have at least an extra $50 to put in his savings account