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professor190 [17]
3 years ago
5

Mary took a math test and she got four questions incorrect and 21 correct. What percent did answer correctly?

Mathematics
1 answer:
AnnZ [28]3 years ago
6 0

Answer:

84%

Step-by-step explanation:

21 correct + 4 wrong = 25 questions in total

\frac{21}{25} x 4 = \frac{84}{100}

\frac{84}{100} = 0.84

0.84 = 84%

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3 years ago
Please help... I have no clue
muminat

Answer:

OPTION C:  Sin C - Cos C = s - r

Step-by-step explanation:

ABC is a right angled triangle. ∠A = 90°, from the figure.

Therefore, BC = hypotenuse, say h

Now, we find the length of AB and AC.

We know that:   $ \textbf{Sin A} =  \frac{\textbf{opp}}{\textbf{hyp}} $

and    $ \textbf{Cos A} = \frac{\textbf{adj}}{\textbf{hyp}} $

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Hence, the length of the side AC = rh

Now, to compute the length of AB, we use Cos B.

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⇒  $ \textbf{AB} = \textbf{sh} $

Hence, the length of the side AB = sh

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$ Sin C = \frac{opp}{hyp} $

⇒  $ Sin C = \frac{AB}{BC} $

              $ = \frac{sh}{h} $

               = s

Sin C = s

$  Cos C = \frac{adj}{hyp} $

$ \implies Cos C = \frac{AC}{BC} $

⇒ Cos C = $ \frac{rh}{h} $

Therefore, Cos C = r

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