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never [62]
1 year ago
7

Evaluate the expression 21 ÷ 3 + 8 − 4. A) 19 B) 17 C) 15 D) 11

Mathematics
2 answers:
N76 [4]1 year ago
6 0

Answer:

D) 11

Step-by-step explanation:

Division and multiplication always comes first in an equation. Since there is no multiplication in the expression, we can divde first.

21 / 3 = 7

Our new expression will be: 7 + 8 - 4

Now we can just add (7) , (8), and (-4) not caring about the order, since they are all addition or subtraction.

I'll do the addition first, but order does not matter.

7 + 8 = 15

15 - 4 = 11

So 11 is our final answer.

Looking at the answer choices, D has 11, so D is our answer for this question.

nirvana33 [79]1 year ago
5 0

Answer:

D

Step-by-step explanation:

We will use the order of operations to evaluate the expression.

From left to right , Multiplication/Division followed by Addition/Subtraction.

21 / 3 + 8 - 4

= 7 + 8 - 4

= 15 - 4

= 11

Therefore, the answer is D

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Given that mean (μ) = 130 texts, standard deviation (σ) = 20 texts

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From the normal distribution table, P(x > 130) = P(z > 0) = 1 - P(z < 0) = 1 - 0.5 = 50%

Option 2 is correct

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Option 3 is incorrect

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z=\frac{x-\mu}{\sigma} \\\\z=\frac{130-130}{20} =0

Option 5 is incorrect

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z=\frac{x-\mu}{\sigma} \\\\z=\frac{160-130}{20} =1.5

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