We need a step by step answer to 2(3 d-1)

Mathematics

1 answer:

Effectus [21]3 years ago

7 0

First figure out what it mean

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The mass per unit volume of a substance is called __________.

astraxan [27]

Answer: Density

This measurement tells you how packed in a substance is. The higher the density, the more the object weighs for a certain volumetric unit (such as a cubic meter). Eg: a cubic meter of feathers is likely to weigh less than a cubic meter of solid gold because the feathers have a lot more air in them as opposed to the gold which is more compact.

density = mass/volume is the formula you often use

3 0

3 years ago

All interns for Comcast are required to be tested for drug use. The imperfect test gives positive results (indicating drug use)

lakkis [162]

Answer:

0.0224 or 2.24%

Step-by-step explanation:

The probability that an intern uses drugs, given that the test is negative, is determined by the probability of false negative divided by the probability of a negative (true or false).

A false negative occurs when an intern who uses drugs (10%) takes the test and gets a negative. Since the test gets it right 80% of the time, the probability of this happening is:

$P(FN) = 0.10*(1-0.80)=0.02$

A true negative occurs when an intern who does not use drugs (90%) takes the test and gets a negative. Since the test gets it wrong 3% of the time, the probability of this happening is:

$P(TN) = 0.90*(1-0.03)=0.873$