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3 years ago

In how many ways can 50 cards be chosen from a standard deck of 52 cards using permutations

1 answer:

8 0

Permutation of 50 is 50! or 50*49*48*47*46.... and so on. I doubt they actually want you to find out what 50*49*48... is, so I'd just put 50!

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Add. (3t - 3) + (6t2 + 4t + 13) + (-8t2 + 11t - 1)? A) -2t2 + 18t + 9 B) -2t4 + 182 + 9 C) 2t4 - 18t - 9 D) 2t4 + 18t + 9

azamat

Let's simplify step-by-step.

3t−3+6t2+4t+13−8t2+11t−1

=3t+−3+6t2+4t+13+−8t2+11t+−1

Combine Like Terms:

=3t+−3+6t2+4t+13+−8t2+11t+−1

=(6t2+−8t2)+(3t+4t+11t)+(−3+13+−1)

=−2t2+18t+9

8 0

3 years ago

A research scientist wants to know how many times per hour a certain strand of bacteria reproduces. He wants to construct the 95

Galina-37 [17]

Answer:

The minimum sample size required for the estimate is 345.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.025 = 0.975$ , so Z = 1.96.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The standard deviation is known to be 1.8.

This means that $\sigma = 1.8$

What is the minimum sample size required for the estimate?

This is n for which M = 0.19. So

$M = z\frac{\sigma}{\sqrt{n}}$

$0.19 = 1.96\frac{1.8}{\sqrt{n}}$

$0.19\sqrt{n} = 1.96*1.8$

$\sqrt{n} = \frac{1.96*1.8}{0.19}$

$(\sqrt{n})^2 = (\frac{1.96*1.8}{0.19})^2$

$n = 344.8$

Rounding up to the next integer:

The minimum sample size required for the estimate is 345.

8 0

3 years ago

These are my last points plzzz i need help with this one. please give a step by step answer

Olegator [25]

Answer:

the price for each doughnut is $1.05

Step-by-step explanation:

doughnuts = d

cookies = c

2d + 3c = $3.30

5d + 2c = $4.95

to find the answer multiply 2 with the first equation, and multiply -3 with the second equation.

4d + 6c = 3.30

-15d - 6c = -14.85

combine like terms

-11d = -11.55

divide by -11

d = 1.05

4 0

2 years ago

Nhich pairs of triangles appear to be congruent? Check all that apply.

Fiesta28 [93]

Answer:

Answer is B and C Triangles 1, 3 and 4 appear to be congruent

8 0

2 years ago

I WILL GIVE BRAINLIEST!!! PLZ HELP ASAP!!!

Fed [463]

Answer:

Step-by-step explanation:

Calculate the distance using the distance formula

d = √ (x₂ - x₁ )² + (y₂ - y₁ )²

with (x₁, y₁ ) = E(- 2, 2) and (x₂, y₂ ) = F(4, - 6)

EF = $\sqrt{(4+2)^2+(-6-2)^2}$

= $\sqrt{6^2+(-8)^2}$

= $\sqrt{36+64}$

= $\sqrt{100}$ = 10 → C

7 0

3 years ago

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