21. The force, F, required to pull a block up an incline is given by F = 10.21x, where x represents the weight of the block in kilograms. Write the equation in function notation and then find F(15) and f(26). What do these values represent?

Evaluate the given expression if m=45 |-3m|

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).

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2