1.open intervals on which the function is increasing
2. open intervals on which the function is decreasing
3. open intervals on which the function is constant

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

An equation in slope-intersept form the lines that passes thought (-8,1) and is perpindicular to the y=2x-17.

Triangles abc and dfg are given. find the lengths of all other sides of these triangles if: b ∠a≅∠d, ab·dg=ac·df, ac=7 cm, bc=15 cm, fg=20 cm, and df-ab=3 cm.