I don't really know what I'm doing but yea I really need help ​

y = 39

Step-by-step explanation:

y = 4 + 5x

substitute 7 for x

y = 4 + 5(7)

y = 4 + 35

y = 39

example 2 – simplify: step 1: completely factor both the numerators and denominators of all fractions. step 2: change the division sign to a multiplication sign and flip (or reciprocate) the fraction after the division sign; essential you need to multiply by the reciprocal. step 3 : cancel or reduce the fractions.

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answer: d.) the total number of protons and neutrons is 15

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your friendly neighborhood human spider! .