(a)[2]
Simplify the expression $4c + 2d - c + 6d$.
(b)[2]
Calculate the value of $h$ for $m = 4$ and $n = -6$.
(c)[2]
Solve for $x$ in $7(x - 3) = 56$.
(d)[2]
Make $t$ the subject in the formula $r = 6t + 7$.
(e)[4]
Use the diagram to write down an equation and solve it to determine the value of $x$.