X²=361/100,<br> please help<br>

I need help with this quick question!! Extra points and I’m marking brainlist to step by step explanation

mezya [45]

Answer:

They all are solutions!

Step-by-step explanation:

$3x-y=15\\6x-2y=30\\$

An easy way to check this is just to substitute each pair of values into both equations:

(a) $3(6)-3=15\\6(6)-2(3)=30\\So before going any farther, we can see that A works!\\\\$

(b)

$3(7)-6=15\\6(7)-2(6)=30\\So B works!\\$

(c)

$3(8)-9=15\\6(8)-2(9)=30\\So C works!$

Have a nice day!

7 0

3 years ago

Read 2 more answers

Several years ago, 38% of parents who had children in grades K-12 were satisfied with the quality of education the students r

Colt1911 [192]

Answer:

$0.428 - 1.96\sqrt{\frac{0.428(1-0.428)}{1165}}=0.3995$

$0.428 + 1.96\sqrt{\frac{0.428(1-0.428)}{1165}}=0.4564$

We are confident that the true proportion of people satisfied with the quality of education the students receive is between (0.3995, 0.4564), since the lower value for this confidence level is higher than 0.38 we have enough evidence to conclude that the parents' attitudes toward the quality of education have changed.

Step-by-step explanation:

For this case we are interesting in the parameter of the true proportion of people satisfied with the quality of education the students receive

The confidence level is given 95%, the significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical values are:

$z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96$

The estimated proportion of people satisfied with the quality of education the students receive is given by:

$\hat p =\frac{499}{1165}= 0.428$

The confidence interval for the proportion if interest is given by the following formula:

$\hat p \pm z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}$

And replacing the info given we got:

$0.428 - 1.96\sqrt{\frac{0.428(1-0.428)}{1165}}=0.3995$

$0.428 + 1.96\sqrt{\frac{0.428(1-0.428)}{1165}}=0.4564$

We are confident that the true proportion of people satisfied with the quality of education the students receive is between (0.3995, 0.4564), since the lower value for this confidence level is higher than 0.38 we have enough evidence to conclude that the parents' attitudes toward the quality of education have changed.

8 0

4 years ago

PLEASE HELP AND SHOW YOUR WORK!!

trasher [3.6K]

Answer: The answer would be B) 9% Decrease!

275 - 250 = 25.

25/275 = 0.0909090909

0.0909090909 x 100 = 9.09090909091

Finally you'd round it to 9%.

Therefore there was a 9% decrease in the amount of large pizzas.

Hope this helps (: Stay safe.

8 0

3 years ago

Read 2 more answers

The perimeter of a rectangle is 208 inches. The ratio

bearhunter [10]

Answer:

65 in and 39 in respectively

Step-by-step explanation:

Let r be the common ratio; when we multiply both L and R by this common ratio, we'll get the actual length and actual width of the rectangle, Recalling that the formula for the perimeter of a rectangle is P = 2L + 2R, we get:

2(5r) + 2(3r) = 16r = 208 in

Then r = 208/16 = 13

Thus, the actual length is 5(13 in) and the actual width is 3(13 in.),

or 65 in and 39 in respectively.

As a check, calculate 65 in / 39 in; this comes out to 5:3, as required.

Then

6 0

3 years ago

If the simple interest on $5,000 for 7 years is $2,450, then what is the interest rate?

Kryger [21]

Answer:

76%

Step-by-step explanation:

5,000 x the princable starting point

2450 is half of the whole

since the simple intrest is 76

fix the decimale point

and your answer is 76%

8 0

3 years ago

X²=361/100, please help ​

X²=361/100, please help