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3 years ago

9

How do you know if -4^2 is -16 or 16?

1 answer:

alex41 [277]3 years ago

4 0

$\text{Hey there!}$

$\bf{-4^2=-4\times-4=16}\\\bf{You\ factor\ out\ the\ exponent\ by\ multiplying.\ Like\ how\ I\ did.}\\\\\\\\\boxed{\boxed{\text{Answer: 16}}}\checkmark$

$\text{Good luck on your assignment and enjoy your day!}$

~ $\frak{LoveYourselfFirst:)}$

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What should a size of a sample be in order to have a margin of error of 4% for a 90% confidence level from a population with a s

vagabundo [1.1K]

Answer:

We need a sample size of 2,071,800 or higher.

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:

$\alpha = \frac{1-0.9}{2} = 0.05$

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

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$

Now, we 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.

In this problem:

We need a sample size of n or higher, when $M = 0.04, \sigma = 35$ . So

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

$0.04 = 1.645*\frac{35}{\sqrt{n}}$

$0.04\sqrt{n} = 1.645*35$

$0.04\sqrt{n} = 57.575$

$\sqrt{n} = 1439.375$

$\sqrt{n}^{2} = (1439.375)^{2}$

$n = 2,071,800$

We need a sample size of 2,071,800 or higher.

6 0

3 years ago

Please help, Im lost. 3x-7 = 5x+3

vlada-n [284]

Answer:

x= -5

Step-by-step explanation:3x-7=5x+3, subtract 3x from both sides, you get -7=2x+3, subtract 3 from both sides you get -10=2x. divide both sides by 2 and you get x= -5

3 0

3 years ago

Please help! 15 points!!!!

victus00 [196]

It would be c I think: the problem says 2 divided by five and all the others are 5 divided by two

6 0

4 years ago

Helppppppppppppppppppppppp

Alisiya [41]

Answer:

50 degrees

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

What is the factorization of the trinomial below? x^3-2x^2-35x

TiliK225 [7]

The answer is

First take an X out of all the terms
X(x^2-2x-35)
X(x-7)(x+5).

The answer is C

6 0

4 years ago