2x+6y=6 has to be solved by elimination
-2x+y=8 has to be solved by elimination

Answer:

$21.60

Step-by-step explanation:

240 x .09 = 21.60

Answer:

x= - square root 141 or x= square root 141

The answer is 4! Please give brainliest it is very easy question and answer unless you're  a few months old, which you're probably not that smart to be here. Anyways, go continue whatever else ur doing i guess

Answer:

10

Step-by-step explanation:

Hope this helps

Answer:

10

Step-by-step explanation:

-5(-2)

negative times negative in multipling and divding the answer is always a positive

Answer: I believe its all of them...

Step-by-step explanation:

Answer:

that is a trapezoid.if it were a rectangle it would have four sides but not equal if it was a square it would have four sides but equal.a parallelogram it would be seen somehow slopy and a rhombus too.so that is a trapezoid.

Answer:

a=10.1

k=3

Step-by-step explanation:

Lets solve the first equation first.

94=10a-7

Lets add 7 to both sides.

101=10a

Divide both sides by 10 to isolate a

101/10=a

a=10.1

Lets do the second equation.

7k+10=31

Subtract 10 from both sides

7k=21

Divide 7 by both sides to isolate k

k=3

Answer:

u just asked 2 questions so..... you typed them? i really dont understand ur question but 2 + 2 =

Step-by-step explanation:

loll

Answer: you just did

Step-by-step explanation:

you just sked a question

2+2=fish

2+2=4

Answer:

14

Step-by-step explanation:

I am preatty sure its 14 hope this helps

Answer:

A. 180

b. 7

Step-by-step explanation:

Answer:

a. $180

b. $7

Step-by-step explanation:

In order to easily find the cost of x amount of pens, first find the unit price:

Part A - Find the cost of 15 pens:

Part B - How many pens can be bought for $84?:

Answer:

She will pay $33,228 in interest over 15 years for a mortgage of $150,000 with an interest rate of 2.75%.  

By the time she pays off her mortgage in 15 years, she will have spent $183,228 total for her house.  

Step-by-step explanation:

Step-by-step explanation:

15 + 17 + 23 + 19

32 + 42 = 74

74/4 = 18.5 is the mean

Answer:

Mean= 18.5

Step-by-step explanation:

How to Find the Mean

Add up all data values to get the sum

Count the number of values in your data set

Divide the sum by the count

The mean is the same as the average value in a data set.

Mean Formula

The mean x of a data set is the sum of all the data divided by the count n.

Answer:

The percentage of people taking the test who score between 489 and 573 is 34%.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

Approximately 95% of the measures are within 2 standard deviations of the mean.

Approximately 99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean of 573, standard deviation of 84

Percentage of people taking the test who score between 489 and 573

The mean is 573.

489 = 573 - 84, which means that 489 is one standard deviation below the mean.

The normal distribution is symmetric, which means that 50% of the measures are below the mean and 50% are below the mean.

So between one standard deviation below the mean and the mean, the percentage is 68/2 = 34%

The percentage of people taking the test who score between 489 and 573 is 34%.

Answer:

The pvalue of the test is 0.3844 > 0.1, which means that there is not sufficient evidence at the 0.10 level to support the executive's claim

Step-by-step explanation:

A publisher reports that 35% of their readers own a laptop.

This means that the null hypothesis is:

[tex]H_0: p = 0.35[/tex]

A marketing executive wants to test the claim that the percentage is actually different from the reported percentage.

This means that the alternate hypothesis is:

[tex]H_{a}: p \neq 0.35[/tex]

The test statistic is:

[tex]z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]

In which X is the sample mean, [tex]\mu[/tex] is the value tested at the null hypothesis, [tex]\sigma[/tex] is the standard deviation and n is the size of the sample.

0.35 is tested at the null hypothesis:

This means that [tex]\mu = 0.35, \sigma = \sqrt{0.35*0.65}[/tex]

A random sample of 190 found that 32% of the readers owned a laptop.

This means that [tex]X = 0.32, n = 190[/tex]

Z-statistic:

[tex]z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]

[tex]z = \frac{0.32 - 0.35}{\frac{\sqrt{0.35*0.65}}{\sqrt{190}}}[/tex]

[tex]z = -0.87[/tex]

pvalue of the test and decision:

As we are testing that the mean is different from a value and z is negative, the pvalue of the test is 2 multiplied by the pvalue of z = -0.87

Looking at the z-table, z = -0.87 has a pvalue of 0.1922

2*0.1922 = 0.3844

0.3844 > 0.1, which means that there is not sufficient evidence at the 0.10 level to support the executive's claim

9514 1404 393

Answer:

  60

Step-by-step explanation:

Gavin has 20/4 = 5 times as many sweets as his corresponding number of ratio units. The total number of ratio units is 4+5+3 = 12, so the total number of sweets is 5×12 = 60.

There are 60 sweets altogether.

_____

They are divided as ...

Answer:

the common difference is = 7

Step-by-step explanation:

1st term is 13

2nd term is 20

d = 2nd -1st

d= 20-13

d= 7

Answer:

Yes . It is arithmetic & the common difference of them is 7 .

Step-by-step explanation:

Hope this helps ;)

Answer:

The price of each book without sales tax

Step-by-step explanation:

Answer:

Step-by-step explanation:

The answer should be somewhere near 6* 2 = 12 which is the first answer. Do not put an exact answer when you are asked for an estimate.

The exact answer is 6.48 * 1.8 = 11.664 which makes 12 look like a pretty good estimate.

Answer:

48

Step-by-step explanation:

All you need to do since this is an array all you need to do is multiply the 2 smaller ones together.

Answer:

Colleen alone to clear the yard of leaves in 40 minutes

Step-by-step explanation:

P.S - The exact question is -

Given - Seas and Colleen are raking leaves in their yard. Working together they can clear the yard of leaves in 24 minutes. What kind of long it would take Sean 20 minutes longer to clear the yard dinner with Colleen working alone

To find - When c is the number of minutes it would take Colleen to finish the job when working alone, the situation is modeled by this rational equation: How long would it take Colleen alone to clear the yard of leaves?

Proof -

Given that the equation is -

[tex]\frac{1}{c} + \frac{1}{c+20} = \frac{1}{24} \\\frac{c + 20 + c}{c(c+20)} = \frac{1}{24}\\\frac{2c + 20}{c^{2} +20c} = \frac{1}{24}\\24(2c + 20) = c^{2} +20c\\48c + 480 = c^{2} +20c\\28c + 480 = c^{2}\\c^{2} - 28c - 480 = 0\\c^{2} - 40c + 12c - 480 = 0\\c(c - 40) + 12(c - 40) = 0\\(c+12)(c-40) = 0\\c = -12, 40[/tex]

As time can not be negative

So,

we get

c = 40 minutes

∴ we get

Colleen alone to clear the yard of leaves in 40 minutes

Answer:

Number of bacteria when t = 0 is 2,000

Step-by-step explanation:

Given:

Number of bacteria in a culture by equation

Q(t) = 2(729^t)

Value of t = 0

where t is number of hours

Find:

Number of bacteria when t = 0

Computation:

Given equation

Q(t) = 2(729^t)

Put t = 0

Q(0) = 2(729⁰)

We know that;

a⁰ = 1

So,

Q(0) = 2(729⁰)

Q(0) = 2(1)

Q(0) = 2

Number of bacteria when t = 0 is 2,000

Step-by-step explanation:

I am sure you are 100 percent Clear.

Thanks.

the answer that you're looking for is 5.5 or 5 1/2, it's the same thing.

Answer:

Correct

Step-by-step explanation:

Answer:

4:1

Step-by-step explanation:

9514 1404 393

Answer:

  see below

Step-by-step explanation:

Carry out the math element by element. For example, ...

  c11 = -7a11 +3b11

  c11 = -7(8) +3(5) = -41

_____

Additional comment

Matrix operations like this one are easily handled by all spreadsheets and most graphing calculators. Some scientific calculators support matrix operations as well.

Answer:

480 ft

Step-by-step explanation:

Answer:

1/4 of however many cups of onions she starts with

Step-by-step explanation:

I see no attachment and it doesn't say in your question how many onions she has. All you have to do is take the total amount of onions and divide it by 4 since she is splitting her total into 4 pots.