3 years ago

-1+(-3) What is the answer? Show your work

Mathematics

2 answers:

postnew [5]3 years ago

8 0

Answer:

its -3

Step-by-step explanation: PEMDAS so you do -1 x -3= -3

uranmaximum [27]3 years ago

3 0

Answer:

-4

Step-by-step explanation:

-1+(-3)

golden rules in math

+*- = -

+*+=+

-*-=+

-*+=-

hence -1+(-3)= -1-3=- 4

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The margin of error of the random selection is 0.20

The given parameters are:

$n = 420$ --- the sample size

$\sigma = 1.6$ --- the standard deviation

$\bar x = 10$ --- the mean

$\alpha = 99\%$ --- the confidence level.

The margin of error (E) is calculated as follows:

$E = z \times \sqrt{\frac{\sigma^2}{n}}$

So, we have:

$E = z \times \sqrt{\frac{1.6^2}{420}}$

$E = z \times \sqrt{\frac{2.56}{420}}$

The z-value for 99% confidence level is 2.576.

Substitute 2.576 for z

$E = 2.576 \times \sqrt{\frac{2.56}{420}}$

$E = 2.576 \times \sqrt{0.006095}$

Take square roots

$E = 2.576 \times 0.0781$

Multiply

$E = 0.2012$

Approximate

$E = 0.20$

Hence, the margin of error is 0.20