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2 years ago

11

On the last chemistry exams a student scored 83, 89, and 92. What score must the student earn on the next exam to have an averag

e of at least 90?

1 answer:

Dmitrij [34]2 years ago

5 0

In order to get an average of 90, the student needs to get a score of 96.

The average can be found by summing up all the numbers in a data set and then dividing it by the number of characters in that dataset.

Assuming the average is 90, and that the score the student needs to get is x, the formula would be:

<em>Average = Sum of scores / Number of scores </em>

90 = (83 + 89 + 92 + x) / 4

90 x 4 = 264 + x

x = 360 - 264

x = 96

The student needs to get a score of 96 on the last exam.

<em>Find out more at brainly.com/question/13406591.</em>

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REAL LIFE A cylindrical hazardous waste container has a diameter of 1.5 feet and a height of 1.6 feet. Abo

aivan3 [116]

Answer:

It can hold up to $1.256ft^3$ of waste

<em></em>

Step-by-step explanation:

Given

$D = 1.5ft$ -- Diameter

$h = 1.6ft$ -- height

Required

Determine the amount of waste it can hold

This simply means that we calculate the volume of the cylindrical container.

And this is calculated using:

$Volume = \pi r^2h$

Where

$\pi = 3.14$

and

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$r = 0.75$

So, we have:

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3 years ago

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3 years ago

The Royal Fruit Company produces two types of fruit drinks. The first type is 55% pure fruit juice, and the second type is 80% p

Stolb23 [73]

Answer:

First type of fruit drinks: 48 pints

Second type of fruit drinks: 32 pints

Step-by-step explanation:

Let's call A the amount of first type of fruit drinks. 55% pure fruit juice

Let's call B the amount of second type of fruit drinks. 80% pure fruit juice

The resulting mixture should have 65% pure fruit juice and 80 pints.

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$A + B = 80$

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$0.55A + 0.8B = 0.65 * 80$

$0.55A + 0.8B = 52$

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$-0.8A -0.8B = -0.8*80$

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$-0.8A -0.8B = -64$

+

$0.55A + 0.8B = 52$

--------------------------------------

$-0.25A = -12$

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