Given f(x) = -2(x + 5), find f(3)

What is the most accurate measurement of 1 pound

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

Asquare parking lot has 6,400 square meters what is the length in meters