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anyanavicka [17]

2 years ago

15

A stocks value decreased the same amount each day for 4 days. If the total change in value was -2.5 what was the change each day

?

1 answer:

KIM [24]2 years ago

4 0

Answer:

-0.625

Step-by-step explanation:

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Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a

Alina [70]

Given:

30-hour review course average a score of 620 on that exam.

70-hour review course average a score of 749.

To find:

The linear equation which fits this data, and use this equation to predict an average score for persons taking a 57-hour review course.

Solution:

Let x be the number of hours of review course and y be the average score on that exam.

30-hour review course average a score of 620 on that exam. So, the linear function passes through the point (30,620).

70-hour review course average a score of 749. So, the linear function passes through the point (70,749).

The linear function passes through the points (30,620) and (70,749). So, the linear equation is:

$y-y_1=\dfrac{y_2-y_1}{x_2-x_1}(x-x_1)$

$y-620=\dfrac{749-620}{70-30}(x-30)$

$y-620=\dfrac{129}{40}(x-30)$

$y-620=\dfrac{129}{40}(x)-\dfrac{129}{40}(30)$

$y-620=\dfrac{129}{40}(x)-\dfrac{387}{4}$

Adding 620 on both sides, we get

$y=\dfrac{129}{40}x-\dfrac{387}{4}+620$

$y=\dfrac{129}{40}x+\dfrac{2480-387}{4}$

$y=\dfrac{129}{40}x+\dfrac{2093}{4}$

We need to find the y-value for $x=57$ .

$y=\dfrac{129}{40}(57)+\dfrac{2093}{4}$

$y=183.825+523.25$

$y=707.075$

$y\approx 707.1$

Therefore, the required linear equation for the given situation is $y=\dfrac{129}{40}x+\dfrac{2093}{4}$ and the average score for persons taking a 57-hour review course is 707.1.

4 0

2 years ago

I NEED HELP ASAP 50 points and will give brainiest

Stels [109]

Answer:

A - (1,2) (2,6)

B - 3.5

C - I don't know... Sorry

D - At least 3.5

E - (5,6) (1,2)

Step-by-step explanation:

5 0

2 years ago

How to do lond division 0.6÷0.0024

Kryger [21]

So...notice first off, the 0.6 has 1 decimal, the 0.0024 has 4 decimals

what happens is, the dot goes poof BUT, you need to add as many zeros to each number as the other's decimals.

the 0.6 has one decimal, so 0.0024 gets an added zero and loses the dot, to become 000240.

the 0.0024 has four decimals, thus the 0.6 gets added 4 zeros then, and loses the dot, to become 060000

and then you divided that, those are the dividend and divisor.

3 0

3 years ago

Rounded to the nearest thousandth, what is the decimal equivalent of

const2013 [10]

The correct answer is b

4 0

3 years ago

Read 2 more answers

Stephen has three sweaters: one is blue, one is red and one is green. He pulls a sweater out of his dresser at random. What is t

ozzi

Answer:

1/3 or 33%

Step-by-step explanation:

Since there are 3 sweaters and only one is green, the ratio of green sweaters to all sweaters is 1:3. As a fraction, this ratio is 1/3. Finally, as a percentage, this fraction/ratio is 33%. Therefore, there is a 33% chance Stephen pulls out a green sweater.

4 0

3 years ago

Read 2 more answers