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Dmitriy789 [7]
3 years ago
13

∣x−2∣=∣4+x∣solve for x

Mathematics
2 answers:
Darya [45]3 years ago
6 0

Answer:

-1

Step-by-step explanation:

hodyreva [135]3 years ago
5 0

Answer:

x= 2+2\sqrt{2}, 2-2\sqrt{2},2

Step-by-step explanation:

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If ED = 2x + 4 and DF = 4x - 6. Find DG. Show your work. someone help me out please.
pentagon [3]

Answer:

5=x

Step-by-step explanation:

2x+4=4x-6

-2x     -2x

4=2x-6

+6     +6

10=2x

÷2   ÷2

5=x

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3 years ago
Expand and simplify (x + 3)(x-4)
sweet [91]
Answer: x^2x-12 (by the way ^2 is a square)
4 0
3 years ago
Read 2 more answers
The perimeter of a regular octagon is 24a + 48 inches.(a) write an expression for the length of any one side of the octagon. The
Lubov Fominskaja [6]

Answer:

3a+6

Step-by-step explanation:

3a+6 = 24a+48 divided by 8 (there are 8 sides in an octagon)

covert 24a +48 inches into feet

2a+4 feet = 18 feet

subtract 4 from both sides

2a = 14

divided 2 from both sides

a = 7

covert 3a+6 inches into feet

0.25a +0,5

0.25(7)+0.5

= 2.25

verify your answer

2.25 x 8 = 18

4 0
3 years ago
You are to take a multiple-choice exam consisting of 64 questions with 5 possible responses to each question. Suppose that you h
damaskus [11]

Answer:

a) Expected score on the exam is 12.8.

b) Variance 10.24, Standard deviation 3.2

Step-by-step explanation:

For each question, there are only two possible outcomes. Either you guesses the answer correctly, or you does not. The probability of guessing the answer of a question correctly is independent of other questions. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The expected value of the binomial distribution is:

E(X) = np

The variance of the binomial distribution is:

V(X) = np(1-p)

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

64 questions.

So n = 64

5 possible answers, one correctly, chosen at random:

So p = \frac{1}{5} = 0.2

(a) What is your expected score on the exam?

E(X) = np = 64*0.2 = 12.8

(b) Compute the variance and standard deviation of x. Variance =Standard deviation

V(X) = np(1-p) = 64*0.2*0.8 = 10.24

Variance 10.24

\sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{64*0.2*0.8} = 3.2

Standard deviation 3.2

5 0
3 years ago
A local restaurant offers a deal if you purchase 3 medium pizzas you get 2 side dishes for free if you get a total of 8 side dis
Margarita [4]
11 you count by 3 with the pizzas and 2 with the side dishes
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3 years ago
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