Which property explains the step shown in solving the equation?5(x − 2) = 12x − 39 ⇒ 5x − 10 = 12x − 39

Hi there!  

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I believe your answer is:  

Distribution property

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Here’s why:  

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From the first step to the next step, the 5 gets distributed into the 'x-2'. The distribution property is getting used.

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Hope this helps you. I apologize if it’s incorrect.  

answer: the answer is 127 degrees

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

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.