MATLAB - Problems

Please help, THANK YOU!

1. Make a 3D plot of an ice cream cone. The cone portion is 6 inches tall with a 3-inch diameter base. The ice cream top is a hemisphere with a diameter of 3 inches. A parametric equation for the cone is: x = r cos() y= r sin() 4r with 0 2 and 0 r 1.5 A parametric equation for the sphere is: x = r cos()sin(p) y-r sin()sin(p) with 0 2 and 0 z = rcos(p) 2. An elliptical staircase that decreases can be modeled by the parametric equations x= rcos(1) y = rsin(t) ht z=- 20 , a and 20 [bcos())2 +[asin(r)] -10 -20 b are the semimajor and semiminor axes of the ellipse, h is the staircase height, and n is the number of revolutions that the staircase makes. Make a 3-D plot of the staircase with a 20 m, b 10m, h- 18 m, and n-3 . (Create a vector: for the domain 0 to 2n, and use the plot3 command.)