The answer is <span>D. 9 yd. 7 in.
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Let's sum all up:
1yd 2ft 6in + 2yd 1ft 5in + 4yd 2ft 8in
Sum inches:
6 + 5 + 8 = 19 in
12 in = 1 ft
19 in = 1ft 7in
Sum feet:
2 + 1 + 2 + 1(from inches) = 6 ft
3ft = 1yd
6ft = 2y
Sum yards:
1 + 2 + 4 + 2(from feet) = 9 yd
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<span>If the half-life of the drug is 2 hours, then in 2 hours 0.6 mg of the drug becomes 0.3 mg. In two more hours (4 hours total) it is 0.15 mg, 2 more hours (6 hours) .075 mg. In two more hours (8 hours) it is .0375 mg, rounded to 0.04. The answer is 8 hours.</span>
