Which products result in a sum or difference of cubes? check all that apply.

a=(x – 4)(x2 + 4x – 16)
b=(x – 1)(x2 – x + 1)
c=(x – 1)(x2 + x + 1)
d=(x + 1)( + x – 1)
e=(x + 4)(x2 – 4x + 16)
f=(x + 4)(x2 + 4x + 16)

sum of cubes:
(a + b)(a2 – ab + b2) = a3 + b3
difference of cubes:
(a – b)(a2 + ab + b2) = a3 – b3

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b? 1. define a variable for the situation. 2. write an inequality that represents the situation. 3.solve the inequality to find out how many months he needs to keep the website for site a to be less expensive than site b. 4. using words, describe how many months he needs to keep the website for site a to be less expensive than site b.

Emma will roll two number cubes labeled 1 through 6. she will record the sum of the two numbers after each roll. she will roll the two cubes 540 times. how many times should emma expect the sum to equal 5?

When y’all answer can y’all explain too !