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3 years ago

5

Naomi has earned $50 mowing lawns the past two days. She worked 3 1/2

1 answer:

nlexa [21]3 years ago

6 0

I’m sorry I don’t know I would help but I don’t know lol

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A coin is tossed 3 times. what is the probability of obtaning two heads out of the 3 tosses

Nataly [62]

I answered a similar problem yesterday.
In three coin tosses there are 8 possible outcomes:
H H H
H H T
H T H
T H H
T T H
T H T
H T T
T T T

Of those results, four out of the eight have at least 2 tails and so the probability is (4/8) or50%

If you need the probability of getting EXACTLY 2 tails then the probability is (3/8) or .375

3 0

2 years ago

Given cosθ= -<img src="https://tex.z-dn.net/?f=%5Cfrac%7B7%7D%7B9%7D" id="TexFormula1" title="\frac{7}{9}" alt="\frac{7}{9}" ali

Dafna1 [17]

$\sin {}^{2} (x) + {cos}^{2} (x) = 1$

${sin}^{2} (x) = 1 - {cos}^{2} (x)$

${sin}^{2} (x) = 1 - ({ \frac{ - 7}{9} })^{2} \\$

${sin}^{2} (x) = 1 - \frac{49}{81} \\$

${sin}^{2} (x) = \frac{81}{81} - \frac{49}{81} \\$

${sin}^{2} (x) = \frac{32}{81} \\$

$\sin(x) = ± \sqrt{ \frac{32}{81} } \\$

_____________________________________________

$\tan(x) < 0 \: \: \: and \: \cos(x) < 0$

Thus :

$\sin(x) > 0$

So we have :

$\sin(x) = + \sqrt{ \frac{32}{81} } \\$

$\sin(x) = \frac{ \sqrt{16 \times 2} }{ \sqrt{9 \times 9} } \\$

$\sin(x) = \frac{4 \sqrt{2} }{9} \\$

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$\sin(2x) = 2 \times \sin(x) \times \cos(x)$

$\sin(2x) = 2 \times \frac{4 \sqrt{2} }{9} \times ( - \frac{7}{9} ) \\$

$\sin(2x) = - \frac{56 \sqrt{2} }{81} \\$

5 0

2 years ago

Svetradugi [14.3K]

Answer:

1

Step-by-step explanation:

Because 2 times 1 is 2 plus 1 is equal to 3

3 0

2 years ago

C<br> What is the missing hypotenuse length? *<br> х<br> 6<br> 8

4vir4ik [10]

Step-by-step explanation:

By Pythagoras' Theorem, 6^2 + 8^2 = x^2.

x^2 = 36 + 64 = 100, x = 10.

7 0

2 years ago

Nknjjhbvyugvtfituyjnjjjjjnnnnj

-Dominant- [34]

Answer:

indeed

Step-by-step explanation:

3 0

2 years ago