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3 years ago

Which statements are true?

Mathematics

1 answer:

Gwar [14]3 years ago

3 0

See the attached picture:

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Which expressions are equal to 0 when x = -1? Check all that apply.

lukranit [14]

Answer:

4(x + 1) and 4(x - (-1))

Step-by-step explanation:

4(-1 + 1) = 4(0) = 0

(4 (-1) + 5) = -4 +5 = -1

4(-1 - 1) = 4(-2) = -8

(5 - 4(-1)) = 5 + 4 = 9

4(-1 - (-1)) = 4(0) = 0

4 (-1 + (-1)) = 4(-2) = 8

3 0

3 years ago

Solve the system of equations -x - 2y = 11 and -3x - 2y = -7

rjkz [21]

Answer: (9,-10) or x=9...y=-10

4 0

3 years ago

Toxaphene is an insecticide that has been identified as a pollutant in the Great Lakes ecosystem. To investigate the effect of t

Likurg_2 [28]

Answer:

This data suggest that there is more variability in low-dose weight gains than in control weight gains.

Step-by-step explanation:

Let $\sigma_{1}^{2}$ be the variance for the population of weight gains for rats given a low dose, and $\sigma_{2}^{2}$ the variance for the population of weight gains for control rats whose diet did not include the insecticide.

We want to test $H_{0}: \sigma_{1}^{2} = \sigma_{2}^{2}$ vs $H_{1}: \sigma_{1}^{2} > \sigma_{2}^{2}$ . We have that the sample standard deviation for $n_{2} = 22$ female control rats was $s_{2} = 28$ g and for $n_{1} = 18$ female low-dose rats was $s_{1} = 51$ g. So, we have observed the value

$F = \frac{s_{1}^{2}}{s_{2}^{2}} = \frac{(51)^{2}}{(28)^{2}} = 3.3176$ which comes from a F distribution with $n_{1} - 1 = 18 - 1 = 17$ degrees of freedom (numerator) and $n_{2} - 1 = 22 - 1 = 21$ degrees of freedom (denominator).

As we want carry out a test of hypothesis at the significance level of 0.05, we should find the 95th quantile of the F distribution with 17 and 21 degrees of freedom, this value is 2.1389. The rejection region is given by {F > 2.1389}, because the observed value is 3.3176 > 2.1389, we reject the null hypothesis. So, this data suggest that there is more variability in low-dose weight gains than in control weight gains.

8 0

3 years ago

Can someone help Idk how to any of it

mezya [45]

Answer:

Answer for 11: y=1x-3

Step-by-step explanation:

See picture

5 0

3 years ago

3feet 6in + 8 feet 2in +4in + 2feet 6in

Ede4ka [16]

12 inches in a foot.

6in+2in+4in+6in= 18in (one and half feet)

3+8+2+1= 14 feet

The answer is 14 feet 6 inches.

I hope this helps!
~kaikers

8 0

3 years ago