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belka [17]
3 years ago
14

Find the exact value of the expression cos-1(1/2)

Mathematics
1 answer:
olga55 [171]3 years ago
8 0

Answer:

60

Step-by-step explanation:

Plug it into the calculator

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An engineer stands 200 feet from a tower and sights the top of the tower at a 45° angle of elevation. Find the height of the tow
Alik [6]
Drawing a diagram of a triangle may be helpful. The hypotenuse is irrelevant, but the vertical leg and the horizontal leg are useful. Since we know the engineer is looking up at a 45 degree angle from a distance of 200 feet, we can label the vertical leg the "opposite", since it is on the opposite side of the angle we are given. The horizontal leg then becomes the "adjacent". You can then use trigonometry to solve for the opposite. 
The options are:
sin(theta)= opposite/hypotenuse
cos(theta)= adjacent/hypotenuse
tan(theta)= opposite/adjacent
Since we don't care about the hypotenuse, the last equation is the one to use. The angle we are given can be substituted in for theta:
tan(45)= x/200
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6 0
3 years ago
A man looked in his wallet and found he had 3 more $5 bills than $10 dollar bills. He had a total of $75. How many of each kind
Neko [114]

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Four 10s and seven 5s

Step-by-step explanation:

If you start with one 10, you have to have four 5s. After that you add one of each until you reach 75

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4 years ago
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Answer:

It's a

Step-by-step explanation:

The speed goes up, and so does the time

then the speed stays the same but the time keeps going

then the time keeps going and the speed goes down

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Based on the data below, predict the number of square kilometers of land that will be occupied by inch worms in 50 years.
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