17-(5n / 4)+8 plz help me

Mathematics

1 answer:

Vera_Pavlovna [14]3 years ago

8 0

Answer:

25-5n/4

Step-by-step explanation:

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A customer buys an item that originally costs x dollars from a retail store and uses a $10.00 off coupon. The store clerk uses t

morpeh [17]

Answer:

the value of c(30) is 21.2, which represents the customers final cost of $21.20

Step-by-step explanation:

4 0

3 years ago

Express 150 minutes and 3 1/2 hours asa ratio in its lowest term

Gemiola [76]

150 minutes : 3 1/2 hours

3 1/2 hours = 3.5 hours = 3.5 * 60 = 210 minutes

150 minutes : 3 1/2 hours = <span>150 minutes : 210 minutes
</span>
= 150:210

= 15 : 21

= 5 : 7

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3 years ago

Supposethat z is a normally distributed variable with variance 4. You collect a sample of size n for which you get a sample aver

Nikitich [7]

Answer:

The sample size is 4

Step-by-step explanation:

Null hypothesis: The mean is 2

Alternate hypothesis: The mean is less than 2

Mean = 3

sd = sqrt(variance) = sqrt(4) = 2

At 95% confidence level, t-value is 1.960

Assuming the lower bound of the mean is 1.04

Lower bound = mean - (t×sd/√n)

1.04 = 3 - (1.96×2/√n)

3.92/√n = 3 - 1.04

3.92/√n = 1.96

√n = 3.92/1.96

√n = 2

n = 2^2

n = 4

7 0

3 years ago

Dan bought a new computer for $900. Each year, the value of the computer decreased by 25% of the previous year’s value. At this

lys-0071 [83]

Answer:

$120.14

Step-by-step explanation:

This question is an example of a compound percentage decrease.

To work this out you would first need to convert the percentage of 25 into a decimal. You can do this by dividing the percentage of 25 by 100, this gives you 0.25. This is because percentages are out of 100.

The next step is to minus 0.25 from 1, this gives you 0.75. This is because we are working out the percentage decrease.

The final step is to multiply the amount of 900 by 0.75 to the power of 7, this gives you $120.14.

1) Divide 25 by 100.

$25/100=0.25$