(a)[2]
Simplify $8a + 3b - 2a + b$ by combining the like terms.
(b)[2]
Calculate the value of $4x^2 + xy$ for the given values.
(c(i))[1]
Solve the equation $\frac{x}{4} = 20$.
(c(ii))[2]
Solve the equation $3x - 5 = 16$.
(c(iii))[3]
Solve the equation $5(2x + 1) = 27$.
(d)[2]
Make $r$ the subject of the formula $p = 3r - 5$.