Help me plz thx
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  π/2 units to the left

Step-by-step explanation:

To shift a function to the right by h units, replace x with (x -h). Here, the value of h is -π/2, so the function is shifted the opposite of right.

The function is shifted to the left by π/2 units.

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