What number is halfway between -6 and
+12?

6

Step-by-step explanation:

-6+12=6

3

Step-by-step explanation:

-6  -5  -4  -3  -2  -1  0  1  2  3  4  5  6  7  8  9  10  11  12

If you start crossin out the numbers from the sides and go at the same time to "the middle" you will join at 3, it's like finding the medium

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

(3x-8) or (3x+8)

step-by-step explanation: