Answer:
a) 3(n +2) or 3n+6
b) ×4, +5
Explanation:
a)
The output from the first box is (n+2), which is the input to the second box. That means the output of the second box is (n+2)×3 = 3(n+2) = 3n+6.
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b)
If you were to evaluate the expression 4x+5 for some value of x, you would first multiply x by 4, then you would add 5. This is what the Order of Operations tells you. That is a good place to start for filling in the boxes of the number machine:
(x) ⇒ [×4] ⇒ (4x) ⇒ [+5] ⇒ (4x+5)
The boxes can use the operations ×4 and +5 (left to right).