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3 years ago

I do not know how to work this out... can someone PLEASE help me???

Mathematics

2 answers:

Zolol [24]3 years ago

4 0

= square root 11 (5 - 12 - 2)
= square root 11(-9)
= -9 square root 11

answer is C.
you got it right

olga2289 [7]3 years ago

3 0

5 of something - 12 of the same thing - 2 of the same thing
= 5 of x - 12 of x - 2 of x
=5x-12x-2x
=x(5-12-2)
=-9x

$5 \sqrt{11} -12 \sqrt{11} -2 \sqrt{11} \\~\\=( \sqrt{11} )(5-12-2)\\~\\-9 \sqrt{11}$

I hope you got the idea!

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By using determinant method solve following questions 3x+4y+5z=18. 2x-y-8z=13. 5x-2y+7z=20

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Answer:

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3 years ago

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a chocolate chip cookie has 10 more calories than an ice cream cone. together they have a total of 310 calories.

jasenka [17]

Answer:

The total would be 300

Step-by-step explanation:

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3 years ago

Give the equation of a line that goes through the point ( − 21 , 2 ) and is perpendicular to the line 7 x − 4 y = − 12 . Give yo

nlexa [21]

Given:

Equation of line $7x-4y=-12$ .

To find:

The equation of line that goes through the point ( − 21 , 2 ) and is perpendicular to the given line.

Solution:

The given equation of line can be written as

$7x-4y+12=0$

Slope of line is

$\text{Slope}=-\dfrac{\text{Coefficient of x}}{\text{Coefficient of y}}$

$m_1=-\dfrac{7}{(-4)}$

$m_1=\dfrac{7}{4}$

Product of slopes of two perpendicular lines is -1. So, slope of perpendicular line is

$m_1m_2=-1$

$m_2=-\dfrac{1}{m_1}$

$m_2=-\dfrac{4}{7}$ $[\because m_1=\dfrac{7}{4}]$

Now, the slope of perpendicular line is $m_2=\dfrac{4}{7}$ and it goes through (-21,2). So, the equation of line is

$y-y_1=m_2(x-x_1)$

$y-2=-\dfrac{4}{7}(x-(-21))$

$y-2=-\dfrac{4}{7}x-\dfrac{4}{7}(21)$

$y-2=-\dfrac{4}{7}x-12$

$y=-\dfrac{4}{7}x-12+2$

$y=-\dfrac{4}{7}x-10$

Therefore, the required equation in slope intercept form is $y=-\dfrac{4}{7}x-10$ .

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3 years ago

Are the expressions 3/4a + 8 - 1/4a - 2 and 1/2(a + 12) equivalent? Show why or why not.

natta225 [31]

Answer:Yes they are equivalent.

Step-by-step explanation:

3/4a + 8 - 1/4a - 2 1/2(a + 12)

Combine like terms Distributive property

2/4a+6 1/2a+6

2/4=1/2 (simplify)

1/2+6=1/2+6

4 0

3 years ago

Is 4/8 bigger or smaller than 1/2

jeka94

There are the same because 4/8 is rudeced to 1/2

8 0

3 years ago

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