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Carry out the following operation as if it were a calculation of real experimental results. Express the answer in the correct units with the correct number of significant figures. (a) 7.310 km ÷ 5.70 km(b) (3.26 X 10−3 mg) − (7.88 X 10−5 mg)(c) (4.02 X 106 dm) + (7.74 X 107 dm)(d) (7.8 m − 0.34 m)/(1.15 s + 0.82 s)(e) (9.88 × 10−3 mg) − (9.66 × 10−5 mg)

Respuesta :

Answer:

a) 1.28

b) 2.57*10^-7 mg²

c) 8.14*10^7 dm

d) 3.79 m/s

e) 9.78*10^-3 mg

Step-by-step explanation:

a) 7.31 / 5.7 = 1.28, km/km is the same unit, so they cancel each other out. The answer is 1.28 without unit.

b) (3.26*10^-3) * (7.88*10^-5) = 2.57*10^-7 mg², here, mg * mg, this is mg²

c) (4.02*10^6) + (7.74*10^7) = 8.14*10^7 dm, here, the unit are added together, so we maintain it

d) (7.8 - 0.34) m / (1.15 + 0.82) m = 7.46 m / 1.97 m = 3.79 m/s, here, the numerator has the unit of m, and the denominator has the unit of s. Giving us m/s.

e) (9.88*10^-3) - (9.66*10^-5) = 9.78*10^-3 mg. Here, the unit was subtracted from each other, so we maintain it.

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