Find the matrix that represents a rotation about (0,0) through 90° clockwise

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

What is the rate for one gallon of gasoline

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.