Get the algebraic expressions in the following cases using variables, constants and arithmetic operations:

(i) Subtraction of z from y. c

(ii) One-half of the sum of numbers x and y.

(iii) The number z multiplied by itself.

(iv) One-fourth of the product of numbers p and q. (v) Numbers x and y both squared and added.

(vi) Number 5 added to three times the product of m and n.

(vii) Product of numbers y and z subtracted from 10.

(viii) Sum of numbers a and b subtracted from their product.