Let x is be an array that takes on the values x=1, 1.2, 1.4...... 5. Use Matlab to compute the array y that results from the function y=7 sin (4x). Use Matlab to determine how many elements are in the array y and the value of the third element in the array y. Use matlab to determine how many elements are in the array sin (-pi/2): 0.05: cos (0). Use matlab to determine the 10^th element. Complex numbers: Let x =-7 -5i and y= 4 +3i. Use Matlab to compute x +y, x astiry and x/y. Enter and explain the result of each of the following statements. x =-3 -j astir 4, y=complex (-3, -4) x_r=real(x) x_=imag(x), z=conj(x)