The table shows the circumference of a tree in centimeters, y , at x years. x 0 5 10 15 20 25 y 0 13 point 5 27 40 point 5 54 67 point 5 Choose the function that represents the data.
Answer
A
y is equal to 2 point 7 to the x th power
B
y is equal to 2 point 7 x
C
y is equal to x over 2 point 7
D
y is equal to 2 point 7 x squared
Explanation
The circumference increases by 13.5 cm every 5 years, which is 13.5 ÷ 5 = 2.7 cm per year. The data also include (0, 0), so the function is y = 2.7x. This is choice B, “y is equal to 2.7x.”
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