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3 years ago

If cos B = 3/5 , then what is the positive value of cos 1/2 B , in simplest radical form with a rational denominator?

Mathematics

1 answer:

ahrayia [7]3 years ago

5 0

Answer:

cos(B/2) = 2√5 / 5

Step-by-step explanation:

Use half angle formula:

cos²(B/2) = (1 + cos B) / 2

cos²(B/2) = (1 + 3/5) / 2

cos²(B/2) = (8/5) / 2

cos²(B/2) = 4/5

cos(B/2) = 2/√5

cos(B/2) = 2√5 / 5

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What is the measure of ZB? 28 36 B [?] degrees Enter

Sindrei [870]

All triangles have a measurement of 180 degrees. Therefore, we can use this information to make an equation to find the value of angle B.

Angle B = 180 - (28 + 36)
Angle B = 180 - 64
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So, angle B is equal to 116 degrees.

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3 years ago

plz help me and I kindly ask that u show work if possible? Plz don't answer if u don't know how to do the problem. PLZ help

soldier1979 [14.2K]

part A is just simple multiplication
since there are 2 6 sided number cubes there are 36 possible outcomes(6 sides *6 sides)

Part B is a little trickier. First off, you must find how to get seven.
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Hope this helps!

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3 years ago

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Sedaia [141]

Answer:

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Step-by-step explanation:

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3 years ago

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QveST [7]

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3 years ago

What are the points for f(x)=3^(x-1)-2

Savatey [412]

Answer: (0, -1 $\frac{2}{3}$ ), (1, -1), (2, 1)

Step-by-step explanation:

Set the exponent equal to zero - that is your anchor point.

Then choose an x-value less than and greater than the anchor point.

$\left\begin{array}{c|c|l}&\underline{\quad x\quad }&\underline{\qquad \qquad f(x)\qquad \qquad \qquad \quad }\\\text{less than anchor}&0&3^{0-1}-2=3^{-1}-2=\frac{1}{3}-2 = -1\frac{2}{3}}\\\\anchor\ point&1&3^{1-1}-2=3^{0}-2=1-2 = -1}\\\\\text{greater than anchor}&2&3^{2-1}-2=3^{1}-2=3-2 = 1}\end{array}\right$

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4 years ago