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kozerog [31]
3 years ago
13

If x = -2/3 and y = 27, what is the value of xy + 5/3 ?

Mathematics
2 answers:
Svetlanka [38]3 years ago
7 0

Answer:

B

Step-by-step explanation:

Evaluate the numerator , that is

xy + 5 = ( - \frac{2}{3} × 27 ) + 5 = - 18 + 5 = - 13 , then

\frac{-13}{3}

= - \frac{13}{3} → B

Fittoniya [83]3 years ago
6 0

Answer:

b)\frac{-13}{3}

Step-by-step explanation:

\frac{xy + 5}{3}\\\\\frac{\frac{-2}{3}27 + 5}{3}\\\\\frac{-18 + 5}{3}\\\\\frac{-18 + 5}{3}\\\\\frac{-13}{3}

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Step-by-step explanation:

Use pythag to solve.

x^2+5^2=13^2

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a triangle has a perimeter of 10x+2 . two sides have lengths of 5x and 2x+9 what is the length of the 3rd side
stiks02 [169]
Since all the sides add up to 10x+2, that means that 10x-2-<side1>-<side2>=<side3>. Plugging it in, we have 10x-2-5x-(2x+9)=side3, and 5x-2-(2x+9)=side3, then expanding it to 5x-2-2x-9=3x-11=side3
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What percent of the surface area of the ottoman is green (not including the bottom)? Round to the nearest tenth.
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8 0
3 years ago
I NEED HELP PLEASE, THANKS! :)
Elena L [17]

Answer:

First option is the right choice.

Step-by-step explanation:

\frac{1}{\cos \left(x\right)+1}+\frac{1}{\cos \left(x\right)-1}\\\\\frac{\cos \left(x\right)-1}{\left(\cos \left(x\right)+1\right)\left(\cos \left(x\right)-1\right)}+\frac{\cos \left(x\right)+1}{\left(\cos \left(x\right)+1\right)\left(\cos \left(x\right)-1\right)}\\\\=\frac{\cos \left(x\right)-1+\cos \left(x\right)+1}{\left(\cos \left(x\right)+1\right)\left(\cos \left(x\right)-1\right)}\\\\=\frac{2cos\left(x\right)}{cos^2\left(x\right)-1}\\\\=\frac{2cos\left(x\right)}{sin^2\left(x\right)}

=2\cdot \frac{cos\left(x\right)}{sin\left(x\right)}\cdot \frac{1}{sin\left(x\right)}\\\\=-2cot(x)csc(x)

Best Regards!

7 0
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