12a+(−7)+12a=13 what is the value of a

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32

Is there an x intercept in the equation 60*1.15^x