3 years ago

Nine more than three times a number is

Mathematics

1 answer:

Veronika [31]3 years ago

5 0

3x + 9 Let x=the number

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Calculate size of angle x. I worked out CA=14cm

nikdorinn [45]

Answer:

∠x = 13.43°

Step-by-step explanation:

area ΔABC = 1/2 ( BD x AC) = 1/2 (22 x AC) = 42

22 x AC = 84 AC = 84/22 = 42/11 = 3.82

CD = BD - BC = 22 - 6 = 16

AD² = AC² + CD² = (3.82)² + 16² = 270.59

AD = 16.45

sin ∠x = AC / AD = 3.82 / 16.45 = 0.2322

∠x = 13.43°

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3 years ago

a studernt has pased 60 percent of 20 quizzes he has written so far successfully. if the student 50 quizzes during the year, and

faust18 [17]

Answer:

72%

Step-by-step explanation:

There are a total of 50 quizzes in the year

From the first 20, the student passes 60%. This makes a total of

$\frac{60}{100} (20) = 12$

12 passes

Out of the remaining 30 quizzes the student passes in 80% of them. This makes a total of

$\frac{80}{100} (30) = 12$

24 passes

Adding the two values

12 + 24 = 36

The student passes 36 quizzes out of 50.

We convert this to a percentage

$\frac{36}{50} (100) = 72$ %

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3 years ago

Rita has already prepared 3 kilograms of dough and will continue preparing 1 kilogram of dough every hour. How much dough did Ri

Digiron [165]

Answer:

Step-by-step explanation:

9+3=12

hope it helps

btw I need one more brainliest to level up

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3 years ago

If x = y then 3x = 3y gemotry prove

otez555 [7]

Multiplying both sides of an equation by the same number keeps the equation true. In this example, both sides are multiplied by 3, so the equation isn't changed.

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3 years ago

Factor the following polynomial completely.<br> -x^2y^2 + x^4 + 9y^2 - 9x^2

castortr0y [4]

See attached picture for answer:

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3 years ago