(a(i))[1]
Solve for $x$ in the equation $x + 7 = 15$.
(a(ii))[3]
Solve for $x$ in $5(3x + 8) = 10$.
(b(i))[2]
Write an expression for the total cost, in dollars, when there are $x$ members.
(b(ii))[3]
Write down an equation, then solve it to determine $x$.