plumbear376

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University of Texas at Dallas

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Geography1Algebra1Calculus1Mathematics1

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16 Jun 2021

What is geography

Where is the word taken from?

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16 Jun 2021

Geography is the study of places on the Earth. More specifically, it relates t...

How do you find the exact value of cos 3pi/4?

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16 Jun 2021

cos(3pi/4) = cos (pi - pi/4) - cos(pi -pi/4) = - cos(pi/4) = -1/sqrt 2

Twice a number (z)added to 21 is equal to 9 times the number added to 7. What is the number?

A. z = -4

B. z = -2

C. z = 2

D. z = 4

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16 Jun 2021

The number is 2. 2z + 21 = 9z + 7 21 - 7 = 9z - 2z 14 = 7z 14/7 = z z = 2