Question 113216
If I understand your problem correctly you have an answer of:
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{{{S = 21.98*sqrt(625) + 153.8}}}
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and you need to evaluate this answer.
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Use a calculator to find that {{{sqrt(625) = 25}}}. Then you can substitute 25 for {{{sqrt(625)}}}
and you reduce the given equation to:
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{{{S = (21.98*25)+153.8}}}
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Do the multiplication in the parentheses. 21.98 times 25 equals 549.5 
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When you substitute this into the equation it becomes:
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{{{S = 549.5 + 153.8}}}
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The addition of the two terms on the right side results in:
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{{{S = 703.3}}}
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This is the answer to the given problem. Hope it helps you to see how to do it.
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