3 years ago

Why is it important to write numbers in different ways

1 answer:

5 0

Do you mean like you cant close your 4 because teachers may think its a nine? Or different ways like written, numeraly and all that?

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Calculate the velocity of a moving train with a mass 10,000kg and 150,000J of energy.

Viefleur [7K]

Kinetic energy possessed by moving train is $E_k = 150000J$ .

And mass $m = 10000kg$ .

The formula for kinetic energy is $E_k = \frac{m\times v^2}{2}$ .

Solve for velocity:

$E_k = \frac{m\times v^2}{2}\implies 2E_k = m\times v^2$

$v^2=\frac{2E_k}{m}\implies \underline{v = \sqrt{\frac{2E_k}{m}}}$

Now put in the data:

$v = \sqrt{\frac{2\times150000J}{10000kg}}\approx5.48\frac{m}{s}$

5 0

3 years ago

Jackie worked 7.5 hours yesterday. If she earns $8.05 an hour, how much did she earn yesterday?

sladkih [1.3K]

Answer 60.375
Explanation
All you do is multiply 7.5 by 8.05 which gets you 60.375

4 0

3 years ago

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If you wanted to shift the graph of y = 2x + 5 up, which equation could you

S_A_V [24]

Answer: the answer is

A. y=2x+9

8 0

3 years ago

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Michael has $12,500 to invest. he invests part in an account which earns 4.2% annual interest and the rest in an account which e

Dimas [21]

Suppose he invest x dollars in one account, y in the other
x+y=12,500
0.042x+0.062y=669.50
multiple the first equation by 0.042: 0.042x+0.042y=525
subtract this new equation from equation 2: 0.02y=144.50
y=7225
x=12500-7225=5275

8 0

3 years ago

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A dentist selected 16 patients at random from a population of more than 1000 patients and asked them how many times the patient

tankabanditka [31]

The mode is the number that apppers the most on any graph.

0 appears twice
1 doesn't appear at all
2 appears once
3 appears once
4 doesn't appear at all
5 appears four times
6 appears three times
7 appears five times
8, 9, or 10 do not appear on the graph at all

So to find the mode we find the number that appears on the graph the most, the number that appears on the graph the most is 7, it appears 5 times, so 7 is the mode of this graph.

6 0

3 years ago