Which expression is a difference of squares?
100x^2-55y^2
100x^2+55y^2
100x^2+49y^2
100x^2-49y^2

can be written in the difference of squares.

Option: D

Step-by-step explanation:

We know that

Take the equation and can be written as follows.

100 is the square of 10

49 is the square of 7

is the square of x

is the square of y

Thus we can write the as the difference of squares.

By using the formula we can write   as

100 - 49

Step-by-step explanation:

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40