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3 years ago

NEED HELP YOU GUYS!!!!

Mathematics

1 answer:

AURORKA [14]3 years ago

5 0

Answer:

x1=

$\frac{ - 2 + \sqrt{100} }{ - 48}$

x2=

$\frac{ - 2 + \sqrt{100} }{ - 48}$

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a store is having a sale on chocolate chips and walnuts. for 9 pounds of chocolate chips and 7 pounds of walnuts, the total cost

Ratling [72]

Answer:

The cost for each pound of chocolate chips is $2.75 and the cost for each pound of walnuts is $3.75.

Step-by-step explanation:

9x+7y=51

3x+5y=27

----------------

9x+7y=51

-3(3x+5y)=-3(27)

-------------------------

9x+7y=51

-9x-15y=-81

-------------------

-8y=-30

8y=30

y=30/8

simplify,

y=15/4

9x+7(15/4)=51

9x+105/4=51

9x=51-105/4

9x=(204-105)/4

9x=99/4

x=(99/4)/9

x=(99/4)(1/9)=99/36

simplify

x=2.75

So the cost for each pound of chocolate chips is $2.75 and the cost for each pound of walnuts is $3.75.

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3 years ago

The temperature at noon is -4 degrees the temperature drops 1 1/2 degrees per hour for 4 hours. What is the temperature at 4 pm?

lapo4ka [179]

-4 × -1.5 = -6 degrees. -4 + -6 = -10 degrees

6 0

3 years ago

Problem PageQuestion A Web music store offers two versions of a popular song. The size of the standard version is 2.6 megabytes

dalvyx [7]

Answer:

There were 210 downloads of the standard version.

Step-by-step explanation:

This question can be solved using a system of equations.

I am going to say that:

x is the number of downloads of the standard version.

y is the number of downloads of the high-quality version.

The size of the standard version is 2.6 megabytes (MB). The size of the high-quality version is 4.2 MB. The total size downloaded for the two versions was 4074 MB.

This means that:

$2.6x + 4.2y = 4074$

Yesterday, the high-quality version was downloaded four times as often as the standard version.

This means that $y = 4x$

How many downloads of the standard version were there?

This is x.

$2.6x + 4.2y = 4074$

Since $y = 4x$

$2.6x + 4.2*4x = 4074$

$19.4x = 4074$

$x = \frac{4074}{19.4}$

$x = 210$

There were 210 downloads of the standard version.

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3 years ago

12% of 72 is what number

kozerog [31]

Answer:

8.64

Step-by-step explanation:

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3 years ago

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Easy problem lots of points explain how to do it please

wlad13 [49]

Answer:

$y= -2+\frac{2}{3}x$

Step-by-step explanation:

Multiply both sides by 2

2x=3y+6

Move variable to the left-hand side and change its sing

-3y=6-2x

Divide both sides of the equation by -3

$y= -2+\frac{2}{3}x$

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3 years ago

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