The center of circle (x-7)^2+(y-2)^2=100 is (-7,-2) . true or false ? !

The answer would be false because the formula for a circle is: 

 (x-h)^2+(y-k)^2=r^2

Some people use (h, k) as the center or (a, b). It does not make a difference. Since the formula subtracts, you must flip the sign to find the circle. The real center is (7, 2) 

I'll do the first one for you. it isn't very hard at all.on number one, you have (50 × 3), which equals 150, and (3 × 3), which equals 9. after you establish that, you add 150 and 9 together. so, (150 + 9) equals 159.this means that 53 × 3 = 159.