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3 years ago

(HELP THIS IS TIMED!)

Mathematics

2 answers:

scoundrel [369]3 years ago

6 0

Answer:

1,3,5,6

Step-by-step explanation:

Sorry I didn't get to this in time, but if you see this, please give me brainliest, apariently I need it to get to the next answer. Thank you for your time.

nevsk [136]3 years ago

5 0

Answer:

8x^2 with 40 as the numerator

Step-by-step explanation:

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12.3 Activity: 5 dollars

romanna [79]

Answer:

We don't have the task, we need it to solw it.

5 0

3 years ago

Use a graphing calculator to solve the system of linear equations. 2.1x+4.2y=14.7 −5.7x−1.9y=−11.4

tia_tia [17]

I used my calculator and got x=1 y=3

solve for y to put them in your calculator

2.1x+4.2y=14.7

y = (14.7 -2.1x)/4.2

−5.7x−1.9y=−11.4

y=(-11.4 +5.7x)/(-1.9)

then using the ploting tool I plotted them and found where they intersected

3 0

3 years ago

What's the square of the quantity of 18 less than x

Zigmanuir [339]

(18 - x)^2

If (a - b)^2 then the answer is a^2 - 2ab + b^2

18^2 - 36x + x^2

The answer is x^2 - 36x + 324

8 0

3 years ago

Consider the following hypothesis test. : : The following results are for two independent samples taken from two populations. Ex

I am Lyosha [343]

Answer:

$z = -1.53$ --- test statistic

$p = 0.1260$ --- p value

Conclusion: Fail to reject the null hypothesis.

Step-by-step explanation:

Given

$n_1 = 80$ $\bar x_1= 104$ $\sigma_1 = 8.4$

$n_2 = 70$ $\bar x_2 = 106$ $\sigma_2 = 7.6$

$H_o: \mu_1 - \mu_2 = 0$ --- Null hypothesis

$H_a: \mu_1 - \mu_2 \ne 0$ ---- Alternate hypothesis

$\alpha = 0.05$

Solving (a): The test statistic

This is calculated as:

$z = \frac{\bar x_1 - \bar x_2}{\sqrt{\frac{\sigma_1^2}{n_1} + \frac{\sigma_2^2}{n_2} }}$

So, we have:

$z = \frac{104 - 106}{\sqrt{\frac{8.4^2}{80} + \frac{7.6^2}{70} }}$

$z = \frac{104 - 106}{\sqrt{\frac{70.56}{80} + \frac{57.76}{70}}}$

$z = \frac{-2}{\sqrt{0.8820 + 0.8251}}$

$z = \frac{-2}{\sqrt{1.7071}}$

$z = \frac{-2}{1.3066}$

$z = -1.53$

Solving (b): The p value

This is calculated as:

$p = 2 * P(Z < z)$

So, we have:

$p = 2 * P(Z < -1.53)$

Look up the z probability in the z score table. So, the expression becomes

$p = 2 * 0.0630$

$p = 0.1260$

Solving (c): With $\alpha = 0.05$ , what is the conclusion based on the p value

We have:

$\alpha = 0.05$

In (b), we have:

$p = 0.1260$

By comparison:

$p > \alpha$

i.e.

$0.1260 > 0.05$

So, we fail to reject the null hypothesis.

4 0

3 years ago

How is 81 written as a product of its prime factors

Sunny_sXe [5.5K]

Answer:

Step-by-step explanation:

lets remember which are the prime numbers 1 to 81

2,3,5,7,23,29,31,37,....83

the only way you can write 81 as a product of its prime factors are

3x3x3x3=3^4

5 0

3 years ago