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g100num [7]
3 years ago
7

Which expression is equal to 0 when simplified?

Mathematics
1 answer:
aksik [14]3 years ago
6 0
The answer is A) 2n-3m-(2n+3m)
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True or False: You can be considered a living thing even without a DNA based genetic code,
Illusion [34]

Answer:

True

Step-by-step explanation:

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3 years ago
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A scientist need 10 L of a 20% acid solution for an experiment where she had only a 5% solution and a 40% solution to the neares
andrezito [222]

Answer:

Amount of 5% solution = 5.7 Litres

Amount of 40% solution = 4.3 Litres

Step-by-step explanation:

First, of all, let x be the amount of 5% solution used

Since, the scientist needs 10 L of solution, then;

Let 10 - x be the amount of 40% solution used

Now, we are told that she needs 10 L of a 20% acid solution.

This means that;

5%x + 40%(10 - x) = 20%(10).

Simplifying this gives;

0.05x + 0.40(10 - x) = 0.20 × 10

Expanding the bracket gives;

0.05x + 4 - 0.4x = 2

0.4x - 0.05x = 4 - 2

0.35x = 2

x = 2/0.35

x ≈ 5.7 litres

Thus, she will need to mix 5.7 liters of the 5% solution.

Since 10 - x be the amount of 40% solution used , then;

the amount of 40% solution = 10 - 5.7 = 4.3 litres

4 0
3 years ago
The value of x =<br> 60°<br> 5<br> x<br> 30°
nikklg [1K]

Answer:

10

Step-by-step explanation:

with reference angle 30°

perpendicular (p) = 5

hypotenuse (h) = x

Now

sin 30° = p / h

1 / 2 = 5 / x

x = 10

Hope it will help :)

6 0
3 years ago
Solve triangle. round to the nearest tenth​
LUCKY_DIMON [66]

Answer:

37.5 ( i didn't round cause the answer looked simple already)

Step-by-step explanation:

formula for triangle is base x height divided by 1/2

Base(5) x Height(15) = 75 now divide by 1/2

75 divided by 1/2 = 37.5

(Could i have brainliest if i'm right?)

4 0
3 years ago
4 times[9-6 divided by three
djyliett [7]

Answer:

28

Step-by-step explanation:

9-6/3=9-2=7

4*7=28

5 0
3 years ago
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