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2 years ago

Ujalakhan help! (x+2)(y-1) Simplify.

Mathematics

2 answers:

yarga [219]2 years ago

6 0

Answer:

solution,

$(x + 2)(y - 1) \\ = x(y - 1) + 2(y - 1) \\ = xy - x + 2y - 2$

Hope this helps...

Gekata [30.6K]2 years ago

4 0

Answer:

We can use the distributive property.

(x + 2)(y - 1)

= x(y) - x(1) + 2(y) - 2(1)

= xy - x + 2y - 2

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When the author visited Dublin, Ireland (home of Guinness Brewery employee William Gosset, who first developed the t distributio

disa [49]

Answer:

The Decision Rule

Fail to reject the null hypothesis

The conclusion

There is no sufficient evidence to support the claim that the mean age of the cars is greater than that of taxi

Step-by-step explanation:

From the question we are told that

The data is

Car Ages 4 0 8 11 14 3 4 4 3 5 8 3 3 7 4 6 6 1 8 2 15 11 4 1 6 1 8

Taxi Ages 8 8 0 3 8 4 3 3 6 11 7 7 6 9 5 10 8 4 3 4

The level of significance $\alpha = 0.05$

Generally the null hypothesis is $H_o : \mu_1 - \mu_2 = 0$

the alternative hypothesis is $H_a : \mu_1 - \mu_2 > 0$

Generally the sample mean for the age of cars is mathematically represented as

$\= x_1 = \frac{\sum x_i }{n}$

=> $\= x_1 = \frac{4+ 0+ 8 +11 + \cdots + 8
}{27}$

=> $\= x_1 = 5.56$

Generally the standard deviation of age of cars

$\sigma _1 = \sqrt{\frac{\sum (x_i - \= x)^2}{n_1} }$

=> $\sigma _1 = \sqrt{\frac{(4 - 5.56)^2 + (0 - 5.56)^2+ (8 - 5.56)^2 + \cdots + 8}{ 27} }$

=> $\sigma _1 = 3.88$

Generally the sample mean for the age of taxi is mathematically represented as

$\= x_2 = \frac{\sum x_i }{n}$

=> $\= x_2 = \frac{8 +8 +0 + \cdots + 4
}{20}$

=> $\= x_2 = 5.85$

Generally the standard deviation of age of taxi

$\sigma _2 = \sqrt{\frac{\sum (x_i - \= x)^2}{n_1} }$

=> $\sigma _2 = \sqrt{\frac{(8 - 5.85)^2 + (8 - 5.85)^2+ (0 - 5.85)^2 + \cdots + 8}{ 20} }$

=> $\sigma _2 = 2.83$

Generally the test statistics is mathematically represented as

$t = \frac{(\= x_ 1 - \= x_2 ) - 0}{\sqrt{\frac{\sigma^2_1}{n_1} + \frac{\sigma^2_2}{n_2} } }$

=> $t = \frac{(5.56 - 5.85 ) - 0}{\sqrt{\frac{(3.88)^2}{27} + \frac{(2.83)}{20} }}$

=> $t = -0.30$

Generally the degree of freedom is mathematically represented as

$df = n_1 + n_2 -2$

$df = 27 + 20 -2$

$df = 45$

From the t distribution table the $P(t > t )$ at the obtained degree of freedom = 45 is

$P(t > -0.30 ) = 0.61722067$

So the p-value is

$p-value = P(t > T) = 0.61722067$

From the obtained values we see that the p-value > $\alpha$ hence we fail to reject the null hypothesis

Hence the there is no sufficient evidence to support the claim that the mean age of the cars is greater than that of taxi

5 0

3 years ago

A worker has 25 feet of ribbon to make bows. Each bow uses 2 feet of ribbon. The worker divides 25 by 2 and gets 12.5 as an answ

Andreyy89

It’s B or D , im not that good but I don’t know , so try your best or take educated guess ( or ask a parent )

8 0

3 years ago

When graphing the equation y=-3x+2, a student plotted the y-intercept at 2, then moved down three units and to the left 2 units

kaheart [24]

Answer:

The error is founded in the slope, specifically in the run.

When seen a negative slope, that only applies to the rise but <u>not</u> the run.

Instead, the student should run 1(not 2) units to the <u>right</u>.

The slope had not mentioned any 2 in the run.

So it would sound like down 3, over 1, starting from 2.

7 0

2 years ago

Read 2 more answers

Is 3+z=-19 true, false, or open?<br><br> Sorry can't think right now...

sladkih [1.3K]

First of all z=16 and its true

4 0

2 years ago

Read 2 more answers

You purchase a laptop for $399.99, a carrying case for $24.99 and some cleaner for $5.00. The sales tax rate on your purchase is

Lynna [10]

Answer:

$461.15

Step-by-step explanation:

Total amount of items:

Add all the prices together

399.99+24.99+5=429.98

Sales tax:

Convert 7.25% to a decimal

7.25/100=0.0725

Multiply the total by the decimal

429.98*0.0725=31.17355

Final cost:

Add the sales tax and total amount

429.98+31.17355=461.15355

Round to the nearest cent/hundreth

$461.15

Hope this helps! :)

6 0

2 years ago