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3 years ago

8

Jane made a door frame for the house but does not have a tool to measure the angles. How can she check that the corner is 90 deg

rees?

1 answer:

Marina CMI [18]3 years ago

5 0

Answer:

don't know sorry

Step-by-step explanation:

dont know sorry

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How many ounces of gold are in aa 1414-karat gold chain that weighs 2.52.5 ounces?

Andreas93 [3]

Pure gold is 24 karats.
14-karat gold is 14/24 pure gold.

2.5 oz * 14/24 = 1.458333... oz

3 0

3 years ago

Read 2 more answers

Type the correct answer for each.

xxTIMURxx [149]

If point $\left(x,\ \frac{\sqrt{7}}{3}\right)$ is on the unit ircle, then:

$x^2+\left( \frac{ \sqrt{7} }{3} \right)^2=1 \\ \\ \Rightarrow x^2+ \frac{7}{9} =1 \\ \\ \Rightarrow x^2=1- \frac{7}{9} = \frac{2}{9} \\ \\ \Rightarrow x= \sqrt{ \frac{2}{9} } = \frac{ \sqrt{2} }{3}$

Since, the point is in the second quadrant, x is negative.

Thus, $(x,\ y)=\left(x,\ \frac{\sqrt{7}}{3}\right)=\left(-\frac{ \sqrt{2} }{3},\ \frac{\sqrt{7}}{3}\right)$

Part A:

$3 \sqrt{7} =6\left( \frac{ \sqrt{7} }{2} \right) \\ \\ =6\left( \frac{ \sqrt{7} }{3} \cdot \frac{3}{ \sqrt{2} } \right) \\ \\ =6\left( \frac{ \frac{ \sqrt{7} }{3} }{ \frac{ \sqrt{2} }{3} } \right)=-6\left( \frac{ \frac{ \sqrt{7} }{3} }{ -\frac{ \sqrt{2} }{3} } \right) \\ \\ =-6\left( \frac{y}{x} \right)=-6\tan\theta$

Therefore, $-6\tan\theta=3\sqrt{7}$ .

Part B:

$- \frac{ \sqrt{7} }{2} =- \frac{ \sqrt{7} }{3} \cdot \frac{3}{ \sqrt{2} } \\ \\ =- \frac{ \frac{ \sqrt{7} }{3} }{ \frac{ \sqrt{2} }{3} } = \frac{ \frac{ \sqrt{7} }{3} }{ -\frac{ \sqrt{2} }{3} } = \frac{y}{x} \\ \\ =\tan\theta$

Therefore, $\tan\theta=- \frac{ \sqrt{7} }{2}$

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3 years ago

What is 9x8+43 free brainliest

quester [9]

Answer:

115

Step-by-step:

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2 years ago

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Pls help me this is like really confusing !

riadik2000 [5.3K]

do ya play r o b l o x if ya do tell me your username

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3 years ago

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WILL MARK YOU BRAINLIEST

Naddik [55]

I think x = 78
because 21/14 = 1.5
so x = 1.5*52
x = 78

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3 years ago