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Dmitry_Shevchenko [17]
3 years ago
7

Solve 2x2 + 20x = −38.

Mathematics
1 answer:
cestrela7 [59]3 years ago
4 0
2x^2+20x=-38  divide both sides by 2

x^2+10x=-19, halve the linear coefficient, square it, than add that value to both sides of the equation, in this case add (10/2)^2=25...

x^2+10x+25=6  now the left side is a perfect square

(x+5)^2=6  take the square root of both sides

x+5=±√6  subtract 5 from both sides

x=-5±√6    (so answer c.)
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62,591 + 7.1 X 10-2 in standard notations ​
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Answer:

0.000071

Step-by-step explanation:

The given number that is given in scientific notation is, ............(1)

We need to write this number in standard notation. A number can be written in scientific notation as :

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In standard notation,  

So,  is equivalent to . Hence, the correct option is (d)

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3 years ago
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36

Step-by-step explanation:

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2 years ago
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8 is 40% of what number? Please show your work
KengaRu [80]
Do a proportion
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Negative nine is greater than or equal to the sum of two - fifths times a number and 9.
Bumek [7]

Answer:

W is either -22.5, or less than -22.5

Step-by-step explanation:

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W has to be a negative number, or else it would be greater than 9, which would make the equation wrong.

2/5 times -22 1/2=-9. So w can be -22 1/2 or -22.5

W can then be anything "lower" (on the left side) of -22.5.

W<-22.5

5 0
3 years ago
During a sale, CDs that normally cost $6.98 each were priced at 2 for $12.50. Pete bought 4 CDs at the sale price. How much mone
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Answer:

2.92

Step-by-step explanation:

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4 * 6.98 =27.92

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He saved 2.92

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