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3 years ago

Someone plz help me!!!!!!!!!

Mathematics

1 answer:

mariarad [96]3 years ago

3 0

Answer:

2 1/4

Step-by-step explanation:

=−514+712

Rewriting our equation with parts separated

=−5−14+7+12

Solving the whole number parts

−5+7=2

Solving the fraction parts

−14+12=?

Find the LCD of 1/4 and 1/2 and rewrite to solve with the equivalent fractions.

LCD = 4

−14+24=14

Combining the whole and fraction parts

2+14=214

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Paladinen [302]

Answer:

Step-by-step explanation:

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Simplify:

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Rewrite in the form $(x+a)^2=b$ :

$x^2+8x=4$

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Step-by-step explanation:

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A set of N = 20 exam scores has a mean of m = 50. The instructor discovered that an error was made grading one exam, so 20 point

tatuchka [14]

Answer:

The new mean for the exam scores is 51

Step-by-step explanation:

the mean can be calculated using the formula

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before the 20 points was added, the mean of the score was = 50.

Inserting this into the formula, we have:

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from this, we can compute the sum total of the scores as

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3 years ago

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anzhelika [568]

Answer:

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Step-by-step explanation:

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3 years ago

What is the argument of -5\sqrt{3}+ 5i?

Shtirlitz [24]

Answer:

150 degrees

Step-by-step explanation:

Graphing the complex number we see the angle terminates in the second quadrant. This means the argument, the angle, will be between 90 degrees and 180 degrees.

So if we create a right triangle with that point after graphing it. We see the height of that triangle is 5 because that is the imaginary part. The base of that triangle has length $5\sqrt{3}$ . The problem is this doesn't give us any part of the angle we want, but it does give us the complementary of the part of the angle that is in second quadrant.