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3 years ago

A used CD is a dollar more than one third the price of a new CD. If a new CD costs $18, how much is a used CD

Mathematics

1 answer:

Veseljchak [2.6K]3 years ago

8 0

Answer:

Step-by-step explanation:

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How to find the mean for negative numbers

statuscvo [17]

You can find the mean of negative numbers just the same as for positive numbers. It doesn't hurt for the mean to be negative.

For example, with the number -9, -5, -4, -3, -1 you can find the mean jsut as any other numbers

-9+-5+-4+-3+-1=-22

-22/5=-4.4

the mean for those set of numbers is -4.4

8 0

2 years ago

Two ships have a harbor entrance at the same time. The first ship is traveling at a constant 16 mph, while the second is traveli

stepan [7]

So hmm check the picture below

both ships leave at the same time, one is going 16mph, the other 20mph, 2hrs later on the road

at 16mph well, 2hrs is just 16+16, or 32 miles away
20mph for 2hrs, is 20+20, or 40 miles away

using the law of cosines $\bf x = \sqrt{{{ 32}}^2+{{ 40}}^2-2(32)(40)cos(169^o)}$

again, recall, the angle is in degrees, so, when taking the cosine, make sure your calculator is in Degree mode

5 0

3 years ago

2.2 divided by 2.15>?

Reika [66]

Answer:

1.023255814>

Step-by-step explanation:

Just divide it.

5 0

3 years ago

Lime FG goes through the points (4,9) and (1,3). Which equation represents a line that is perpendicular to FG and passes through

Svetllana [295]

Answer:

First, we know that:

A linear relationship can be written as:

y = a*x + b

where a is the slope and b is the y-axis intercept.

For a line that passes through the points (x1, y1) and (x2, y2), the slope can be written as:

a = (y2 - y1)/(x2 - x1).

Then for line FG = f(x), we know that it passes through the points (4, 9) and (1, 3)

Then the slope is:

a = (9 - 3)/(4 - 1) = 6/3 = 2

f(x) = 2*x + b

To find the value of b we can use one of the points, i will use the point (1, 3)

this means that when x = 1, f(1) = 3.

Then:

f(1) = 3 = 2*1 + b

3 = 2 + b

3 - 2 = b = 1.

The line FG is f(x) = 2*x + 1.

For a general linear equation:

y = a*x + b

The equation for a perpendicular line is:

y = (-1/a)*x + c

We know that:

f(x) = 2*x + 1

The perpendicular line will be something like:

g(x) = (-1/2)*x + c

To find the value of c, we use the fact that this line passes through the point (2, 0), then:

g(2) = 0 = (-1/2)*2 + c

0 = -1 + c

1 = c

The line is: g(x) = (-1/2)*x + 1

6 0

3 years ago

How is adding integers similar to adding whole numbers?

sergejj [24]

Integers can be whole numbers

6 0

3 years ago