2. Write a rule for the linear function in the table.

x f(x)

–1 –5

2 –2

5 1

8 4

A. f(x) = x – 4

B. f(x) = 3x

C. f(x) = x + 4

D. f(x) = x – 5

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)