tge answer is -2x because you have to countdown 4x from 6x. you can coundown because you have the same variable (x) at both numbers (4 and 6). hope it helps!;)
Okay. The equation for a sphere's surface area is A = 4 * pi * r^2. Let's plug 5 in for r. I got 314 cm^2 is the surface area, but it always helps to double check work! Hope this helps!