Hi can anybody explain to me how to do this I'm kinda confused . 5×[5(-7)]

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

How is the equation of this circle written in standard form? x2 + y2 - 6x + 14y = 142 a) (x - 3)2 + (y + 7)2 = 200 b) (x+ 3)2 + (y - 7)2 = 200 (x - 6)2 + (y + 14)2 = 142 d) (x+6)2 + (y- 14)2 = 142

Can you divide 25 into 4 equal groups? explain why or why not.