No one got the correct answer. The answer is supposed to be 7(2d+3k-dk-1). All the coefficients are divisible by 7, thus only the integers are changed. However, the variables cannot be a factor because they do not have the same variables that all the coefficients must have.
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!
