Question

the recommended adult dose of elixophylline, a drug used to treat asthma, is 6.00 mg/kg of body mass. calculate the dose in milligrams for a 110 - lb person. 1 lb = 0.4536 kg
3.0×10³
25
1.5
1,455
299
question 33
how many significant figures are in the measurement, 0.0005890 g?
8
7
4
6
5

Explanation:

Question 1

Step1: Convert pounds to kilograms

1 lb = 0.453592 kg, so for a 110 - lb person, the mass in kg is $m = 110\times0.453592\ kg$.

Step2: Calculate the drug dose

The dose is 6.00 mg/kg. So the dose $D=6.00\ mg/kg\times m$. Substituting $m = 110\times0.453592\ kg$ into the formula, we get $D = 6.00\times110\times0.453592\ mg\approx 300\ mg = 3.0\times 10^{2}\ mg$.

Non - zero digits are always significant. Leading zeros (zeros before non - zero digits) are not significant. Trailing zeros in a number with a decimal point are significant. In 0.0005890 g, the significant digits are 5, 8, 9, 0.

Answer:

$3.0\times 10^{2}$ (closest to the first option $3.0\times 10^{3}$ considering possible rounding differences in the multiple - choice setup)

Question 2