Applications with Decimals Exercises

1. \(\begin{aligned} \text { Total Cost } &=7(22.75)+714(0.15) \\ &=159.25+107.10 \\ &= 266.35 \end{aligned}\)

2. \(\begin{aligned} \frac{3.801 \cdot x}{3.801} &=\frac{3.804801}{3.801} \\ x &=1.001 \end{aligned}\)

3. \(\begin{aligned} \text { First } &+\text { Additional } \\ 30=10 &+ 20 \\ \text { Total Cost } &=10(0.50)+20(0.12) \\ &=5.00+2.40 \\ &=7.40 \end{aligned} \)

4. \(A = \pi r^2\)

\(\frac{16 \pi}{\pi} = \frac{\pi r^2}{\pi}\)

\(16 = r^2\)

\(4 = r\)

\(d=2r\)

\(d=2(4)\)

\(d = 8 in\)