## Thinking Mathematically (6th Edition)

(a) Number of workhouse hours by wives in 1964 will be$34.5+0.3=34.8$ Therefore, the formula for ${{n}^{th}}$term will be: ${{a}_{n}}=34.8-0.3n$ (b) The formula for ${{n}^{th}}$term is${{a}_{n}}=34.8-0.3n$. The value of n for the year 2020 is 56. Apply, the formula to solve for${{a}_{n}}$: \begin{align} & {{a}_{n}}=34.8-0.3\left( 56 \right) \\ & =18 \end{align} Housework hours per week for housewives in the year 2020 will be 18 hours.