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3 years ago

Write the subtraction as an addition: (-27)-(-27)

Mathematics

2 answers:

valentina_108 [34]3 years ago

8 0

Remember two negatives gives you a positive. So:

-27 - (-27) = -27 + 27

Hope this helps you!

maksim [4K]3 years ago

3 0

Remember that when you subtract a negative number, you are really just adding the number. This is represented as:

$a - (- b) = a + b$

Thus, we can simplify

$(-27) - (-27)$ ,

$-27 + 27$

Our answer is -27 + 27.

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The number of Apple iPods sold in 2009 was 54.13 million. That number decreased approximately linearly to 26.38 million iPods so

AleksandrR [38]

Answer:

$A(t) = -6.9375t + 81.88$ is the amount, in millions, for the number of Apple iPods sold in t years after 2005.

Step-by-step explanation:

Linear function:

A linear function has the following function:

$y = mx + b$

In which m is the slope(the value that y changes by when x changes by 1) and b is the y-intercept(the initial value of the output).

Finding the value in 2005:

This is b.

The number of Apple iPods sold in 2009 was 54.13 million. That number decreased approximately linearly to 26.38 million iPods sold in 2013.

So in 4 years, it decreased from 54.13 - 26.38 = 27.75 million.

So the value in 2005 should also be 27.75 million more than in 2009, that is 54.13 + 27.75 = 81.88. So

$y = mx + 81.88$

Using A for y and t for x

$A(t) = mt + 81.88$

Finding the slope:

When we have two points, the slope is given by the change in the output divided by the change in the input.

In 4 years, the amount decrease by 27.75 million. So

$m = -\frac{27.75}{4} = -6.9375$

$A(t) = -6.9375t + 81.88$ is the amount, in millions, for the number of Apple iPods sold in t years after 2005.

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a bookcase is to be constructed as shown in the figure below. the height of the bookcase is 2 feet longer than the length of a s

In-s [12.5K]

The length of the shelf is 10 feet while its height is 10 feet.

<h3>Equation</h3>

Equation is an expression used to show the relationship between the sides and angles of a right angled triangle.

Let x represent the shelf length and y represent the shelf height.

The height of the bookcase is 2 feet longer than the length of a shelf. hence:

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From equation 1 and 2:

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The length of the shelf is 10 feet while its height is 10 feet.

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