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37.5

Step-by-step explanation:

if it decreases by 1/2 every 8 hours;

( 3×8= 24)

the first 8 hours 1/2×300 =150 gram

the second 8 hours(16 hours) = 1/2×150=75 gram

the third 8 hours(24 hours) = 1/2×75= 37.5gram

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d