Convert the polar representation of this complex number into its rectangular form:
z = 4(cos pi/2 + i sin pi/2)

Please help Thank you!!!

The polynomial function of least degree with a leading coefficient of 1 is: f(x) = x3 + ax2 + bx + c

What is the vertical asymptotes of the function f(x)=x-2/x*2-3x-4

Arectangular exercise mat has a perimeter of 36 feet the length of the mat is twich the width writeand solve an equation to determine the length in feet. of the mat then find the area in square feet of the mart