Hello, help me find the appropriate solution using MATLAB commands

Exercises 1 - Write a MATLAB program to calculate the following expression and round the answers to the nearest integer. a) z = 5x2 + y2 where x=2, y=4 b) z = 4cos(x)+ jsin(x) where X=T/4 c) z = 3sin(x)+4cos(x)+3ely) where x=T/3 , y=2 2- Solve the following system x + y - 2z=3 2x + y = 7 x + y - Z=4 3- Write a Program to calculate the electromagnetic force between two electrons placed in vacuum) at a distance (r= 2*10-1 m ) from each other. Charge of electron (Q) is 1.6*10-19 C. Hint: Electromagnetic Force =kQ,Q/r, K=9*109