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3 years ago

Please help answer and explain am begging you

Mathematics

2 answers:

Airida [17]3 years ago

7 0

1,6,7 are positive
2,9 are negative
3,4,5,8 are undefined

Inessa05 [86]3 years ago

4 0

Answer:

1.) positive

2.) negative

3.) zero

4.) undefined

5.) zero

6.) positive

7.) positive

8.) undefined

9.) negative

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Juan and his friends bought drinks for a charity event. The table shows the numbers of each kind of drink bought, and the amount

OverLord2011 [107]

Answer: soda costs $3

Lemonade costs $4

Water costs $2

Step-by-step explanation:

The table shows the number of Soda, lemonade and water bought by Juan, Lee and morris and the total amount each of them spent in buying these drinks

Juan spent $43 on 5 bottles of soda, 4 bottles of lemonade and 6 bottles of water

Lee spent $34 on 2 bottles of soda, 5 bottles of lemonade and 4 bottles of water

Morris spent $41 on 3 bottles of soda, 7 bottles of lemonade and 2 bottles of water

Let price of soda be x

Let price of lemonade be y

Let price of water be z

From the table

5x + 4y + 6z = 43 - - - - - - 1

2x + 5y + 4z = 34 - - - - - - 2

3x + 7y + 2z = 41 - - - - - - -3

Multiply equation 1 by 2 and equation 2 by 5

10x + 8y + 12z = 86

10x + 25y+20z =170

Subtracting

-17y -8z= -84 - - - - - -4

Multiply equation 2 by 3 and equation 3 by 2

6x + 15y+12z = 102

6x + 14y + 4z = 82

Subtracting

y + 8z = 20 - - - - - 5

Add equation 4 and equation 5

-16y = -64

y= -64/-16 = 4

Put y= 4 in equation 4

-17 × 4 -8z = - 84

-68-8z = -84

-8z = -16

z = -16/-8 = 2

Put y = 4 and z = 2 in equation 1

5x + 4×4 + 6×2 = 43

5x + 16 + 12 = 43

5x = 43-28= 15

x = 15/5 = 3

3 0

4 years ago

The cost of renting a community center is $100, with an additional cost of $10 per guest.

Dennis_Churaev [7]

I can’t see it but if I had to say it would be D.

5 0

4 years ago

A 98% confidence interval for the mean of a population is to be constructed and must be accurate to within 0.3 unit. A prelimina

BaLLatris [955]

Answer:

$n = (\frac{2.326*1.7}{0.3})^2= 173.73$

And the value for n rounded up would be n = 174

Step-by-step explanation:

We have the following info given:

$s= 1.7$ previous estimation for the deviation

$ME=0.03$ the margin of error desired

$Conf =0.98$ represent the confidence

The Margin of error is given by:

$ME = z_{\alpha/2} \frac{\sigma}{\sqrt{n}}$

If we solve for the value of n we got:

$n= (\frac{z*\sigma}{ME})^2$

For this problem we know that the confidence is 98% so then the significance level would be $\alpha=0.02$ and the critical value would be:

$z_{\alpha/2}= 2.326$

And replacing we got:

$n = (\frac{2.326*1.7}{0.3})^2= 173.73$

And the value for n rounded up would be n = 174

3 0

3 years ago

3 times a number x, subtracted from 18 is less than -90

Shalnov [3]

Answer:

x > -24

Step-by-step explanation:

18 - 3x < 90

Subtract 18 from both sides.

-3x < 72

Divide both sides by -3. (When diving by a negative, flip the sign.)

x > -24

5 0

4 years ago

Two sisters start in the same place and walk in opposite directions. The

ddd [48]

Answer:

10 yards

Step-by-step explanation:

6+4=10

7 0

3 years ago

Read 2 more answers

Please help answer and explain am begging you ​

Please help answer and explain am begging you