4*2^-3+8*2^-2+5*2^-1

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To simplify the expression
4 2^-3 + 8 2^-2 + 5 * 2^-1

First, calculate the exponents
2^-3 = 1/2^3 = 1/
2^-2 = 1/2^2 = 1/
2^-1 = 1/2

Now substitute the exponents back into the expression
4 (1/8) + 8 (1/4) + 5 * (1/2)

Simplify each term
4/8 + 8/4 + 5/2

Now simplify the fractions
1/2 + 2 + 5/2

Combine the terms
1/2 + 5/2 + 2 = 6/2 + 5/2 + 4/2 = 15/2

Thus, the simplified expression is 15/2 or 7.5.