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viktelen [127]
3 years ago
5

A student scored 80% on a test with 56 questions.How many did they answer right?

Mathematics
1 answer:
rosijanka [135]3 years ago
7 0
80% = 0.8
0.8 * 56 = 44.8 rounded to 45
The student got 45 answer correct.
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c

Step-by-step explanation:

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Answer:

5 2/3

Step-by-step explanation:

2 * 2 5/6

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Find the values of x and y. Pls helpI’m helpless at math
Svetradugi [14.3K]

Answer:

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  • y=\frac{\sqrt{3}}{2}  

Step-by-step explanation:

From the given right-angle triangle

The angle = ∠60°

  • The adjacent to the angle ∠60° is 1/2.
  • The opposite to the angle ∠60° is y.

The hypotenuse = x

<u>Determining the value of x:</u>

Using the trigonometric ratio

cos 60° = adjacent / hypotenuse

substituting adjacent = 1/2 and hypotenuse = x

cos\:60^{\circ }=\:\:\frac{\frac{1}{2}}{x}

\cos \left(60^{\circ \:}\right)=\frac{1}{2x}

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2x=2

Dividing both sides by 2

\frac{2x}{2}=\frac{2}{2}

Simplify

x=1

Thus, the value of hypotenuse x is:

x = 1

<u>Determining the value of y:</u>

Using the trigonometric ratio

sin 60° = opposite / hypotenuse

As we have already determined the value of hypotenuse x = 1

substituting opposite = y and hypotenuse = 1

sin 60° = y/1

y = 1 × sin 60°

y=\frac{\sqrt{3}}{2}       ∵  \sin \left(60^{\circ \:}\right)=\frac{\sqrt{3}}{2}

Therefore, the value of y is:

y=\frac{\sqrt{3}}{2}      

Summary:

  • x = 1
  • y=\frac{\sqrt{3}}{2}    
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Step-by-step explanation:

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What is combined mean
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Combined in mathematics is to add together to find a total. If you combine 1 and 2 you get 3.
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