How to integrate 3^(x+3^x)

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

Acheetah can run 70 per hour. what is the speed in feet per hour

In a quadratic function of the form ax^2+bx+c, which of the following is not true? a. the y-intercept is c. b. if a is positive, the parabola opens up. c. the vertex has an x-coordinate of -b/2a. d. the axis of symmetry is the line y=-b/2a.