Rewrite the following equation in the center-radius form of the equation of a circle.
x2 - 6x + y2 - 8y + 21 = 0

A.
(x - 5)2 + (y - 3)2 = 4
B.
(x - 6)2 + (y - 8)2 = 4
C.
(x - 3)2 + (y - 4)2 = 4
D.
(x - 4)2 + (y - 6)2 = 4

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

If 24 people have the flu out of 360 people, how many would have the flu out of 900. choose many ways you could use proportion that david would use to solve this problem

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.