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3 years ago

PLEASE HELLLP!!!!! If x+7=2y and y=2x−1, what is the value of y? (NOT 13)

Mathematics

1 answer:

oee [108]3 years ago

5 0

Answer:

Step-by-step explanation:

x+7=2y

Subtract 7 from both sides

x=2y-7

2y-7=x

Multiply both sides by 2

4y-14=2x

y=2x−1

Add 1 to both sides

y+1=2x

Combine equations:

y+1=4y-14

Add 14 to both sides

y+15=4y

Subtract y from both sides

15=3y

3y=15

Divide both sides by 3

y=5

The answer is (C) 5.

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Step-by-step explanation:

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4 years ago

What is the value of x in the equation 8 + x = 3? A. −5 B. 5 C. 11 D. 24

zlopas [31]

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3 years ago

Read 2 more answers

A candy company claims that 20% of the candies in its bags are colored green. Steve buys 30 bags of 30 candies, randomly selects

Allisa [31]

Answer:

The probability of Steve agreeing with the company’s claim is 0.50502.

Step-by-step explanation:

Let X denote the number of green candies.

The probability of green candies is, p = 0.20.

Steve buys 30 bags of 30 candies, randomly selects one candy from each, and counts the number of green candies.

So, n = 30 candies are randomly selected.

All the candies are independent of each other.

The random variable X follows a binomial distribution with parameter n = 30 and p = 0.20.

It is provided that if there are 5, 6, or 7 green candies, Steve will conclude that the company’s claim is correct.

Compute the probability of 5, 6 and 7 green candies as follows:

$P(X=5)={30\choose 5}(0.20)^{5}(1-0.20)^{30-5}=0.17228\\\\P(X=6)={30\choose 6}(0.20)^{6}(1-0.20)^{30-6}=0.17946\\\\P(X=7)={30\choose 7}(0.20)^{7}(1-0.20)^{30-7}=0.15328$

Then the probability of Steve agreeing with the company’s claim is:

P (Accepting the claim) = P (X = 5) + P (X = 6) + P (X = 7)

= 0.17228 + 0.17946 + 0.15328

= 0.50502

Thus, the probability of Steve agreeing with the company’s claim is 0.50502.

7 0

3 years ago

Can someone help me with this question please

77julia77 [94]

Answer:

nca - gru is the correct answer

Step-by-step explanation:

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3 years ago

Assume that lines that appear to be tangent are tangent. O is the center of the circle. Find the value of x.

MariettaO [177]

Draw an imaginary line from the vertex of angle x to the center of the circle.
This divides the 4-sided polygon into two right triangles. For example, the upper right triangle has an acute angle whose measure is 135 degrees / 2, or 67.5 degrees, and the another acute angle whose measure is x/2.

x/2 and 67.5 degrees are complementary angles, so x/2 + 67.5 deg = 90 deg. Thus, x/2 = 22.5 deg, and so x = 45 deg. (answer)

8 0

3 years ago