2 years ago

Evaluate: 3x^2 + y when x=1 and y=-3 *

Mathematics

1 answer:

Sliva [168]2 years ago

4 0

Answer:

Step-by-step explanation:

x=1 and y=-3

so 3x^2 + y = 3*1^2 + (-3)

= 3* 1 -3

You might be interested in

Find the minimum sample size needed to estimate the percentage of Democrats who have a sibling. Use a 0.1 margin of error, use a

Brums [2.3K]

Answer:

The minimum sample size is $n =135$

Step-by-step explanation:

From the question we are told that

The confidence interval is $( lower \ limit = \ 0.44,\ \ \ upper \ limit = \ 0.51)$

The margin of error is $E = 0.1$

Generally the sample proportion can be mathematically evaluated as

$\r p = \frac{ upper \ limit + lower \ limit }{2}$

$\r p = \frac{ 0.51 + 0.44}{2}$

$\r p = 0.475$

Given that the confidence level is 98% then the level of significance can be mathematically evaluated as

$\alpha = 100 - 98$

$\alpha = 2\%$

$\alpha =0.02$

Next we obtain the critical value of $\frac{\alpha }{2}$ from the normal distribution table

The value is

$Z_{\frac{\alpha }{2} } = 2.33$

Generally the minimum sample size is evaluated as

$n =[ \frac { Z_{\frac{\alpha }{2} }}{E} ]^2 * \r p (1- \r p )$

$n =[ \frac { 2.33}{0.1} ]^2 * 0.475(1- 0.475 )$

$n =135$

6 0

3 years ago

The probability of choosing a blue marble is 25%. you do experiment and draw a marble 200 times (and replacing the marble drawn

rjkz [21]

50 since 200/4 is 50

7 0

3 years ago

I need a lot of help What is <br> 89/2?

bekas [8.4K]

Answer:

44.5

is the answer

7 0

2 years ago

Read 2 more answers

ASAP <br> -WILL MARK BRIANIST

Zarrin [17]

Answer:

20%

Step-by-step explanation:

40-32=8

8/40=20%

This is what I think I hope it helps If right mark me brainliest If wrong tell me and I will figure out another answer.

4 0

2 years ago

Read 2 more answers

The question is in the image

n200080 [17]

The last one, WVZ~YXZ Because when triangles are put together like that and are equal, the opposites are equvalent

3 0

3 years ago

Read 2 more answers