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2 years ago

Find the distance between each pair of points. (-7, -4) and (-7, 9)

Mathematics

2 answers:

Kruka [31]2 years ago

8 0

Answer:

$distance = \sqrt{ {( - 7 - ( - 7))}^{2} + {(9 - ( - 4))}^{2} } \\ = \sqrt{169} \\ = 13 \: units$

mylen [45]2 years ago

8 0

The person above is correct. The formula for distance is:
D = rad (x2-x1) squared + (y2-y1) squared

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When do you need to use two number lines to compare two fractions

OLEGan [10]

Depends on the fraction to determine your answer

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3 years ago

Help with 21 would be much appreciated.

umka2103 [35]

Answer:

$\large\boxed{x=2\sqrt{21}\ and\ y=4\sqrt3}$

Step-by-step explanation:

Look at the picture.

ΔADC and ΔCDB are similar. Therefore the sides are in proportion:

$\dfrac{AD}{CD}=\dfrac{CD}{DB}$

We have

$AD=14-8=6\\CD=y\\DB=8$

Substitute:

$\dfrac{6}{y}=\dfrac{y}{8}$ <em>cross multiply</em>

$y^2=(6)(8)$

$y^2=48\to y=\sqrt{48}\\\\y=\sqrt{16\cdot3}\\\\y=\sqrt{16}\ cdot\sqrt3\\\\\boxed{y=4\sqrt3}$

For x use the Pythagorean theorem:

$x^2=6^2+(4\sqrt3)^2\\\\x^2=36+48\\\\x^2=84\to x=\sqrt{84}\\\\x=\sqrt{4\cdot21}\\\\x=\sqrt4\cdot\sqrt{21}\\\\\boxed{x=2\sqrt{21}}$

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3 years ago

BRAINLIEST FOR U! answer in 5 mins

irinina [24]

Answer:

I would say the answer is c

3 0

3 years ago

Describe the correct error -1/4 divided by 3/2=-4/1 multiplied by 3/2= -12/2=-6

Rom4ik [11]

I guess the error is in the calculus.
-1/4 divided by 3/2:
(-1/4)/(3/2): When dividing 2 fractions, its answer is equal to the first fraction multiplied by the inverse of the second.
(-1/4)/(3/2) = -1/4 * 2/3 = -2/12
So -1/4 divided by 3/2 is different from -4/1 multiplied by 3/2.
-1/4 divided by 3/2 = -1/4 multiplied by 2/3.

Hope this Helps! :)

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3 years ago

Which equation is part of solving the system by substitution?

gayaneshka [121]

Answer:

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Step-by-step explanation:

x+y=11

x=11-y

5 0

3 years ago

Read 2 more answers