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2 years ago

Use a calculator to find the angle measure to the nearest degree for cos-1 (0.5) 45 Pts!

Mathematics

2 answers:

umka2103 [35]2 years ago

8 0

Step-by-step explanation:

no calculator req

cos 60 is 0.5

so cos inverse of 0.5 os 60°

Amiraneli [1.4K]2 years ago

6 0

$\\ \tt\hookrightarrow cos^{-1}(0.5)$

$\\ \tt\hookrightarrow cos^{-1}\left(\dfrac{1}{2}\right)$

$\\ \tt\hookrightarrow 60°$

Fact about cosine(cos)

$\\ \tt\hookrightarrow cos\theta=\dfrac{Base}{Hypotenuse}$

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3 years ago

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Y 45° 30° N 17 I need help pls

melisa1 [442]

Answer:

x=29.4

Step-by-step explanation:

To help find the sides of a triangle, I use SOHCAHTOA.

SOH - CAH - TOA

S=O/H ( $Sine=\frac{opposite}{hypotenuse}$ )

C=A/H ( $Cosine=\frac{adjacent}{hypotenuse}$ )

T=O/A ( $Tangent =\frac{opposite}{adjacent}$ )

Let's find x first. We know 2 parts of the triangle: the adjacent leg, and the angle that is opposite of that.

So it would be tangent (tan).

opposite = 17

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Plug these numbers into the calculator and you should get your answer.

$\frac{17}{tan(30)} = 29.44486372...$

x=29.4

Try to do y on your own and let me know if you have any questions!

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2 years ago

Celine ate brunch at a restaurant. The bill came to $72.80. If she left a 15% tip, what was the total cost of her brunch?

DedPeter [7]

Answer:

$83.69

Step-by-step explanation:

Given the following

Initial Cost of the brunch = $72.80

Percentage tip = 15%

Tip paid = 15% of $72.60

Tip paid = 0.15 * 72.60

Tip paid = $10.89

Total cost of brunch = $72.80 + $10.89

Total cost of brunch = $83.69

Hence the total cost of her brunch is $83.69

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