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3 years ago

Using approciate properties find -4/73/5+4/7-1/5+2/5*-4/5

Mathematics

1 answer:

slega [8]3 years ago

8 0

Answer: 0.548

Step-by-step explanation:

First you need to remember the formula for PEMDAS(Parenthesis,exponents,multiplication,divison,addition,subtractio)

you can do either multiplication or divison whichever comes first, same with addition+subtraction.

the underlined means to simplify

1.-0.57x3/5+4/7x-1/5+2/5x-4/5

2.-1.71/5+4/7x-1/5+2/5x-4/5

3.-0.342+4/7x-1/5+2/5x-4/5

4.-0.342+0.57x-1/5+2/5x-4/5

5.-0.342+0.57x-0.2+2/5x-4/5

6.-0.342+0.114+2/5x-4/5

7.-0.342+0.114+0.4x-4/5

8.-0.342+0.114+-1.6/5

9.-0.342+0.114+-0.32

10.-0.228+-0.32=-0.548

i did this all in one go so......

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Alenkinab [10]

Answer:

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Step-by-step explanation:

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μxbar=μ=95.25

σxbar=σ/√n=27.32/√25=27.32/5=5.464.

So, the average spending of a sample of 25 randomly-selected professors is normally distributed with mean=μ=95.25 and standard deviation=σ=27.32.

The z-score associated with average spending $102.5

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Z=1.3269=1.33

We have to find P(Xbar>102.5).

P(Xbar>102.5)=P(Z>1.33)

P(Xbar>102.5)=P(0<Z<∞)-P(0<Z<1.33)

P(Xbar>102.5)=0.5-0.4082

P(Xbar>102.5)=0.0918.

Thus, the probability that the average spending of a sample of 25 randomly-selected professors will exceed $102.5 is 0.0918.

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3 years ago

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Rom4ik [11]

Answer:

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Step-by-step explanation:

Given,

Original price = $55.00

Discounted price = $46.75

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= (8.25 / 55.00) x 100%

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3 years ago

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Nimfa-mama [501]

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3 years ago

Using approciate properties find -4/7*3/5+4/7*-1/5+2/5*-4/5

Using approciate properties find -4/73/5+4/7-1/5+2/5*-4/5