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Sergeu [11.5K]
3 years ago
9

Evaluate the expression 3x^2+ y if x = 1 and y = -3.

Mathematics
1 answer:
elena-14-01-66 [18.8K]3 years ago
4 0
3(1)^2-3= 0
Plug in the numbers because x=1 plug In 3(1)^2 and it equals 3 then subtract y which is 3-3= 0
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Convert 20 ounces into pounds. there are 16 ounces in one pound. round answers to the nearest hundredth.
MrRa [10]
The answer is:  " 320 oz. " .
__________________________________________________
<em><u>Note</u></em>:
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20 lb. * (16 oz./ lb.) =   (20 * 16) oz.  = 320 oz.
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5 0
3 years ago
A timer is started and a few moments later a swimmer dives into the water and then comes back up. The swimmer’s depth (in feet)
zhannawk [14.2K]

Answer: The swimmer dives into the water 5 seconds after the timer is started.

The swimmer comes back up 11 seconds after the timer is started.

Step-by-step explanation:

6 0
2 years ago
In a clinical test with 2161 subjects, 1214 showed improvement from the treatment. Find the margin of error for the 95% confiden
Vlad [161]

Answer:

The margin of error for the 95% confidence interval used to estimate the population proportion is of 0.0209.

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 z-score that has a p-value of 1 - \frac{\alpha}{2}.

The margin of error is of:

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

In a clinical test with 2161 subjects, 1214 showed improvement from the treatment.

This means that n = 2161, \pi = \frac{1214}{2161} = 0.5618

95% confidence level

So \alpha = 0.05, z is the value of Z that has a p-value of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

Margin of error:

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

M = 1.96\sqrt{\frac{0.5618*0.4382}{2161}}

M = 0.0209

The margin of error for the 95% confidence interval used to estimate the population proportion is of 0.0209.

4 0
3 years ago
How is 36 classified?
Lostsunrise [7]

Answer: as a number?

Step-by-step explanation:

Be a little more specific

4 0
3 years ago
Y'all need help here​
sasho [114]

Answer:

A

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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