Find the center and the radius of the circle with the equation:
x? + 6x + y2 + 4y + 12 = 0
a. center: (3, 2)
c. center: (6,4)
radius: 1
radius: 12
center: (-3,-2)
center: (-6,-4)
radius: 1
radius: 12

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?