The cost of 8 CDs is £48. What is the cost of 11 CDs if they all the same price?

Could somebody me with this radical simplification?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.