Find the sum: $15 + 0.632 + 13.8$ .

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Solution

Calculate the sum of the given expression:
Given expression: $15 + 0.632 + 13.8$ .
$\begin{array}{rcl} 15 + 0.632 + 13.8 & = & \frac{1}{1000} [(15 \times 1000) + (0.632 \times 1000) + (13.8 \times 1000)] \\ \Rightarrow & 15 + 0.632 + 13.8 = \frac{1}{1000} (15000 + 632 + 13800) \\ \Rightarrow & 15 + 0.632 + 13.8 = \frac{1}{1000} (29432) \\ \Rightarrow & 15 + 0.632 + 13.8 = 29.432 \end{array}$
Hence, the sum of the given expression is $29.432$ .

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Question 1 (b)

Find the sum of the following:

15 + 0.632 + 13.8

\sum_{n = 1}^{10} [{(\frac{1}{2})}^{n - 1} + {(\frac{1}{5})}^{n + 1}] .

Find the sum of first $15$ multiples of $8$ .

Find the sum in each of the following:

(a) 0.007 + 8.5 + 30.08

(b) 15 + 0.632 + 13.8

(d) 25.65 + 9.005 + 3.7

(e) 0.75 + 10.425 + 2

(f) 280.69 + 25.2 + 38

Find thesum in each of the following:

(a) $0.007 + 8.5 + 30.08$

(b) $15 + 0.632 + 13.8$

(d) $25.65 + 9.005 + 3.7$

(e) $0.75 + 10.425 + 2$

(f) $280.69 + 25.2 + 38$

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