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3 years ago

14

two trains leave a station going opposite directions. train 1 travels at 16 mph, train 2 travels at 4 mph. when will the trains

be 48 miles apart?

1 answer:

rjkz [21]3 years ago

6 0

Answer:

the trains will be 48 miles apart at 4 mph

Step-by-step explanation:

hope this helps :D brainliest?

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Two cubes have sides of length 3 cm and 8 cm. what is the ratio of their respective surface areas?

Phoenix [80]

The surface area formula for a cube is: 6 * s^2, where s is the side length.

The two surface areas are:

6 * 3^2 = 54

and

6 * 8^2 = 384

The ratio of their surface areas, from the surface area of the smaller cube to the surface area of the larger cube is:

54/384 = 9/64

The answer is 9/64.

Note that another way to to find the ratio of the squares of the side lengths of the cubes.

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3 years ago

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-x/3+7= -2х +7 <br><br> Need to solve for x

Nezavi [6.7K]

Answer:

x = 0

Step-by-step explanation:

-x/3 + 7 = -2x + 7

Subtract 7 from both sides.

-x/3 = -2x

Add 2x to both sides.

5/3x = 0

x = 0

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2 years ago

How do you Identify and contrast the differences between the rise in prices due to inflation and the rise in prices in microecon

andrezito [222]

One can Identify the differences between the rise in prices due to inflation and the rise in prices in microeconomic markets by?

Observing the trends in prices.
Observing Demand and supply curve.

<h3>Contrast the differences between the rise in prices due to inflation and the rise in prices in microeconomic markets.</h3>

The difference that exist between a rise in price due to the inflation and a rise in price due to microeconomic markets is based on the price changes that has occurred in terms of demand and supply model.

Note that this is said to be the price in a given market but the price rise as a result of to inflation tells that the price rise is one that reaches a lot of markets and not only just one market.

Hence, One can Identify the differences between the rise in prices due to inflation and the rise in prices in microeconomic markets by?

Observing the trends in prices.
Observing Demand and supply curve.

Learn more about inflation from

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2 years ago

Solve the equation 2 cos x + 1 = 0 , 0 <= x <= 2pi PLEASE HELP! WILL AWARD!

Keith_Richards [23]

It would be pi over 6, 5 pi over 6, and 3 pi over 6.

6 0

3 years ago

Read 2 more answers

Can someone help me please? justify your answer also plz!

Afina-wow [57]

Answer:

a. True

b. False

c. True

Step-by-step explanation:

<em>a.</em>

12 ÷ $\frac{36}{7}$ is equal to $\frac{7}{3}$

Personally, I hate fractions so I make these into decimals by dividing the numerator by the denominator, but I'll do both to show you.

Decimal:

$\frac{36}{7}$

In your calculator, type 12

Then the division sign.

Then make parenthesis

in the parenthesis you will have (36/7)

End parenthesis

Press the equal sign and you should get a grand total of 2.333 repeating

To see if its equal to $\frac{7}{3}$ , you put 7 divided by 3 in your calculator next

If you do, you should get 2.333 repeating.

This shows they are equal.

Fraction:

<em>Keep, switch, flip</em>

The first step will be to make your whole number into a fraction.

$\frac{12}{1}$ ÷ $\frac{36}{7}$

The first thing we use is keep

The first number in this equation is that $\frac{12}{1}$

We're going to leave it as it is.

Next we have to use switch. To do this we make the ÷ into a ×

So your problem should look as so:

$\frac{12}{1} * \frac{36}{7}$

Lastly, we have flip.

The last number in our equation is $\frac{36}{7}$

We are going to use the reciprocal of it which would be $\frac{7}{36}$

So your problem should now look like this:

$\frac{12}{1} * \frac{7}{36}$

At this point, we can now cross multiply

So from the numerator 12 to the denominator 36, if we divided 36 by 12 its 3.

But the denominator 1 and the numerator 7 are already divided as much as they can be.

So now your expression should be: $\frac{1}{1} * \frac{7}{3}$

This is because of that cross multiplication we did.

12 goes into 36, 3 times so 3 would substitute 36 while 1 would substitute 12

So now its just basic multiplication

$\frac{1*7}{1*3} = \frac{7}{3}$

So we can conclude that $12 * \frac{36}{7}$ does in fact equal $\frac{7}{3}$

<em>b.</em>

Multiplying a number by $\frac{1}{2}$ is the same as dividing by 2

This is false

When you multiply by 2, you are doubling the original number

When you multiply by $\frac{1}{2}$ , you are cutting the number in half

Ex:

18 * 2 = 36

18 * $\frac{1}{2}$ = 9

If it was dividing instead of multiplying, this would be true but since $\frac{1}{2}$ halves the number whether you multiply or divide it would not be true.

<em>c.</em>

$\frac{3}{2}$ of a number is less than this number

Basically, what this is saying is if you divide by $\frac{3}{2}$ , would it give you less than the original number.

The answer would be true

It would be division first of all because your looking for $\frac{3}{2}$ <em>of</em> a number.

Secondly, if you divide by a fraction or decimal, the number tends to be smaller than the number you started with.

Ex:

6 ÷ $\frac{3}{2}$ = 4 or 6 ÷ 1.5 = 4

Ex2:

682 ÷ $\frac{3}{2}$ = 454.6 repeating or 682 ÷ 1.5 = 454.6 repeating

I hope this helps! Don't be afraid to reach out with any further questions!

4 0

3 years ago