16: B; irrational number, real
17: C; whole, integer, rational, real
18: B; real, rational, integer
Step-by-step explanation:
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A. because in A, it flips the two conditions, which can changes the accuracy of the statement.
It started at $37.
It went down $3.
37 - 3 = 34
It went up 1.
34 + 1 = 35
It went down 7.
35 - 7 = 28
It went up 4.
28 + 4 = 32
The price at the end of the day was $32.