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2 years ago

Can you help me I dont understand6. Solve: 143 = 13y

Mathematics

2 answers:

Charra [1.4K]2 years ago

8 0

Answer:

y=11

Step-by-step explanation:

To isolate the variable, y, you need to divide by 13 on both sides. 13y/13 cancels out, so you are left with 143/13. 143 ÷ 13 is 11, so y = 11.

To Check your answer:

Substitute y for 11. Your equation will be 143 = 13 x 11. Does 13 x 11 = 143? Yes.

Gnoma [55]2 years ago

4 0

Answer:

y=11

Step-by-step explanation:

you have to divide both sides of the equation by the same term and then simplify

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Slice for 5x+c=k for x

Degger [83]

Answer:

A - x = (k-c)/5

Step-by-step explanation:

To solve this problem, we would solve for x like we would in 2x = 6 :

5x + c = k

5x = k-c (subtract c from both sides)

x = k/5 - c/5 (divide 5 on both sides)

x = (k-c)/5 (simplify)

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2 years ago

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This should be easy but plz explain in the best way thank u

pentagon [3]

Answer:

The answer is 1.

Step-by-step explanation:

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3 years ago

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Marrrta [24]

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3 years ago

X/-9 ≥ 3

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Answer:

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3 years ago

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The dwarves of the Grey Mountains wish to conduct a survey of their pick-axes in order to construct a 99% confidence interval ab

Dmitry_Shevchenko [17]

Answer:

The minimum sample size needed is 125.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

For this problem, we have that:

$\pi = 0.25$

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

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This minimum sample size is n.

n is found when $M = 0.1$