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3 years ago

The sum of three numbers is 57

2 answers:

5 0

The first number is 15. The 2nd number is 30 cuz it’s double the first. The third number is 18 less than 30 so it is 12. They all add up to 57. Third # = 12

chubhunter [2.5K]3 years ago

4 0

Answer:

Step-by-step explanation:

Suppose,

The first number is = x

so, the second number is = 2x

so, the third number is = 2x-18

Questionwise,

x+2x+2x-18 = 57

5x = 75

x = 15

so, the third number = (2×15)-18 = 12

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Luba_88 [7]

Answer:

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3 years ago

-6x+4+3x-2?

Dovator [93]

Answer:

Step-by-step explanation:

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3 years ago

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Please help, you don't have to show your work. Like at all.

elixir [45]

The slope of the line is -2.

Solution:

Given points are (-3, -7) and (2, -17).

Here $x_1=-3, y_1=-7, x_2=2, y_2=-17$

Slope of the line:

$$m=\frac{y_2-y_1}{x_2-x_1}$

$$m=\frac{-17-(-7)}{2-(-3)}$

$$m=\frac{-17+7}{2+3}$

$$m=\frac{-10}{5}$

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The slope of the line that passes through the pair of points is -2.

3 0

3 years ago

Shelly has a gift card for her favorite restaurant for $15.she wants to treat a group of friends to sandwiches at the restaurant

elena-14-01-66 [18.8K]

Answer:

The equation for that models the total money and sandwiches bought is $ 15 = X × $4.50 , And The value of X is 3.33

Step-by-step explanation:

Given as :

The total value of gift card = $ 15

The cost of each sandwiches = $4.50

Let The number of sandwiches bought = X

So, According to question

The total value of gift card = cost of each sandwiches × number of sandwiches bought

Or, The total value of gift card = X × $4.50

Or, $ 15 = X × $4.50

∴ X = $\frac{15}{4.50}$

I.e X = 3.33

Hence The equation for that models the total money and sandwiches bought is $ 15 = X × $4.50 , And The value of X is 3.33 Answer

3 0

4 years ago

Solve equation by the quadratic formula. List the solutions, separated by commas.<br> 4r^2 +3r+10=8

slega [8]

Answer:

$-\frac{3}{8} +\frac{\sqrt[]{23}i }{8},-\frac{3}{8} -\frac{\sqrt[]{23}i }{8}$

$-0.375+0.599479i,-0.375-0.599479i$

Step-by-step explanation:

$4r^2+3r+10=8$

Bring the 8 to the left side so that we equal the equation to 0. To do this, simply substract 8 on both sides.

$4r^2+3r+10-8=8-8\\4r^2+3r+2=0$

Where;

$a=4\\b=3\\c=2$

$Formula: x=\frac{-b\frac{+}{}\sqrt[]{b^2-4ac} }{2a}$

Replace. Let x be r

$r=\frac{-3\frac{+}{}\sqrt[]{(3)^2-4(4)(2)} }{2(4)}$

$r=\frac{-3\frac{+}{}\sqrt[]{9-32} }{8}$

$r=\frac{-3\frac{+}{}\sqrt[]{-23} }{8}$

It has no real solution because the square root is negative.

We can say that,

$r=-\frac{3}{8} \frac{+}{}\frac{\sqrt[]{23}*\sqrt[]{-1} }{8}$

$r=-\frac{3}{8} \frac{+}{}\frac{\sqrt[]{23}i }{8}$

$r_1=-0.375+0.599479i\\r_2=-0.375-0.599479i$

5 0

3 years ago