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kvv77 [185]
3 years ago
12

What is the value of the expression 8.3 × 104 − 2.5 × 103 − 1.9 × 104 written in scientific notation?

Mathematics
2 answers:
bezimeni [28]3 years ago
4 0
Remark work with the two numbers that are 10^4 first. Then add in the one that goes to 10^3

Method one
You could change these all to integers and then take it back to scientific notation.

 83 000
<u>-19 000</u>
  64 000
<u>-   2 500
</u>  61 500 <u /><<<<<< answer

Method two
Keep the scientific notation.
 8.3 * 10^4
<u>-1.9 * 10^4</u>
 6.4 * 10^4
<u>-  .25*10^4</u>  Note the powers of ten must be the same.
  6.15*10^4 <<<<<<<< answer
<u>
</u>Either method works. 
<u>
</u>You could use your calculator to get the right answer. I'm not sure all calculators retain the scientific notation. Test yours to see what it does. Enter 8.3*10y^x 4 *1 = 
<u>
</u>Your calculator might have x^y or ^ to record powers. You may also have EE and one of your keys.
<u>
</u>See if your calculator returns 8.3*10^4 or if it returns 83000<u>
</u>
Nady [450]3 years ago
4 0
I believe it is 4.081x10^2
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5 0
3 years ago
I cannot find the answer on my own, I need a lil' bit of help.
viktelen [127]

for any fraction a/b, the decimal format of it is just a ÷ b.

A)

is the number rational?

well, a rational number is one we can write as a ration or fraction, well clearly is a fraction so it is rational.


B)

can it be written as a repeating/recurring decimal?  well, 9/20 is 0.45, so -9/20 is -0.45, no repeating decimal like 0.454545......... , just a plain vanilla -0.45, so nope.


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is it less than -0.4?

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|---------------------  -0.45  --------  -0.40  -------------------  0  ---------------  1  -------------------|

so, -0.45 is farther from 0, and therefore is smaller than -0.4, so yes.

4 0
3 years ago
WILL GIVE BRAINLYIST. HELP
ohaa [14]

Answer:

Both triangles are right triangles because the angle d is 90 degrees in both sides

3 ^ 2 - 2.25^2 = 1.98

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3 0
2 years ago
Read 2 more answers
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