Ineed the first choices are 150 50 250 100 the second choices are 2.5 2.3 1.3 1.5

100x + 1.3

I believe you subtract both of the equations together. Adding them isn't a answer choice, so you must subtract both equations together.

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

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4