The Difference of a number and 7 is the same as 38

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

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

When keisha installed a fence along the 200 foot perimeter of her rectangular back yard, she left an opening for a gate.in the diagram below, she used x to represent the length in feet of the gate? what is the value? a. 10 b. 20 c. 25 d. 30