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Ainat [17]
3 years ago
8

You earned a 84% on a science test. You answered 21 questions correctly. How many questions were on the test?

Mathematics
1 answer:
sergij07 [2.7K]3 years ago
6 0
20 x .80 = 16 
So the answer would be 16. 
I hope this helps :)
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A year ago, Leila wanted to buy a necklace that cost $25.00. This year the same necklace cost $30.00. What was the percent incre
Delicious77 [7]

Answer:

20 %

Step-by-step explanation:

% Increase = Increase/Original value × 100 %

Data:

 Original = $25

This year = $30

Calculations:

   Increase =  This year - original

                  =         30       -      25

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Ulleksa [173]

Answer:

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Measure of angle B = 30.26°

Step-by-step explanation:

The given parameters are;

∠C = 90°

AC = 7

BC = 12

Part 1

Hence, the question has the dimensions of the two adjacent sides of the right angle (angle 90°)

From Pythagoras theorem, we have;

A² = B² + C²

Where, A is the opposite side to the right angle, hence;

In the ΔABC,

AB ≡ A

Therefore;

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Part 2

∠A is the side opposite side BC such that by trigonometric ratios

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Part 3

∠B is found from knowing that the sum of the angles in a triangle = 180°

∴ ∠A + ∠B + ∠C = 180° which gives

59.74° + 90° + ∠B = 180°

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