3 years ago

Which expression is equivalent to −2.1+(−5.9)+(−3.7) ?

Mathematics

2 answers:

ra1l [238]3 years ago

6 0

Answer:

-2.1-5.9-3.7

-117/10

-11.7

Step-by-step explanation:

miv72 [106K]3 years ago

4 0

Answer:

-(2.1 - 5.9) + (-3.7)

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For this case we have the following system of equations:

$x-3y = -13\\5x + 7y = 34$

From the first equation we clear "x":

$x = -13 + 3y$

We substitute in the second equation:

$5 (-13 + 3y) + 7y = 34$

We apply distributive property:

$-65 + 15y + 7y = 34$

We add similar terms:

$-65 + 22y = 34$

We add 65 to both sides:

$22y = 34 + 65\\22y = 99$

We divide between 22 on both sides:

$y = \frac {99} {22}\\y = \frac {9} {2}$

We look for the value of the variable "x":

$x = -13 + 3 \frac {9} {2}\\x = -13 + \frac {27} {2}\\x = \frac {-26 + 27} {2}\\x = \frac {1} {2}$

Thus, the solution of the system is:

$(x, y): (\frac {1} {2}, \frac {9} {2})$

ANswer:

$(x, y): (\frac {1} {2}, \frac {9} {2})$

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The price of a DVD, including 5% sales tax is $21.15. What us the price of the DVD, before sales tax?

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