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2 years ago

Simplify: (3n^2-7n)+(7n^2+n+1)

Mathematics

1 answer:

arlik [135]2 years ago

8 0

Answer: 21n^4 -46n^3 -4n^2 +7n

Step-by-step explanation:

21n^4 +3n^3 +3n^2 -49n^3 -7n^2 +7n =

21n^4 -46n^3 -4n^2 +7n

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The measures, in degrees, of the three angles of a triangle are given by 2x+1, 3x - 3, and 9x. What is the

valentinak56 [21]

Answer:

Step-by-step explanation:

27 degrees

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3 years ago

A mixture of compounds X and Y in a 0.100-cm cell had an absorbance of 0.215 at 272 nm and 0.191 at 327 nm. Find [X] and [Y] in

Oksi-84 [34.3K]

Answer: The concentration of X is $7.13582\times 10^{-6}$ and the concentration of Y is $2.53159\times 10^{-5}$ .

Step-by-step explanation:

Since we have given that

At 272 nm, absorbance = 0.215

At 327 nm, absorbance = 0.191

As we have given that

Compound X Compound Y

272 16400 3870

327 3990 6420

So, our equations becomes

$16400C_1+3870c_2=0.215\\\\3990C_1+6420C_2=0.191$

By solving these two equations, we get that

$C_1=7.13582\times 10^{-6}\\\\C_2=2.53159\times 10^{-5}$

Hence, the concentration of X is $7.13582\times 10^{-6}$ and the concentration of Y is $2.53159\times 10^{-5}$ .

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3 years ago

Please help me with the equation<br><br> 6+z/10= -2

oksian1 [2.3K]

Answer:

z = -26

Step-by-step explanation:

6+z/10= -2

6 + z = -2 (10)

z = -20 - 6

z = -26

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2 years ago

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What error did zacharias make?

qwelly [4]

The equation 0 = -2x2 5x - 3 was the quadratic formula that Zacharias used. However, he started substituting as:
Quadratic formula as x = ; substitution as x

The errors he made: he mistakenly used the negative (-) and postive (+)
* -5 should have been 5
* 52 should have been -52
* both the numerator and the denominator should have been -2 instead of 2

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2 years ago

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What is 2x7 <br>what is 2x2 <br>what is 2x4

GalinKa [24]

Answer:

Step-by-step explanation:

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3 years ago

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