Answer:
27 1/4
Explanation:
You want the value of a³+2b when a=3 and b=1/8.
Evaluation
To find the value of the expression, put each number in place of the corresponding variable and do the arithmetic.
a³ +2b
= 3³ +2(1/8)
= 3·3·3 + 2/8
= 27 + 1/4
= 27 1/4
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Additional comment
The exponent of 3 tells you how many times 'a' is a factor in the product. Here, the product has the factor 3 three times.