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3 years ago

Pls help this is easy but I a ton of stuff I need to do

Mathematics

2 answers:

mylen [45]3 years ago

7 0

Answer:

Two equations: (x + 2 + x + 2 + x + 2) & (3x + 6 = 18) ; x = 4

Step-by-step explanation:

x + 2 + x + 2 + x + 2 = 18

3x + 6 = 18

3x = 12

x = 4

cestrela7 [59]3 years ago

4 0

Answer:

x = 4

Explanation:

2 + 2 + 2 = 6

18 - 6 = 12

12 ÷ 3 = 4

4 = x

x = 4

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VMariaS [17]

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Answer:

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Step-by-step explanation:

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Step 2: 25x² - 4

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3 years ago

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SCORPION-xisa [38]

Answer:

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3 years ago

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3 years ago

Read 2 more answers

A set of data with 750 numbers is normally

kifflom [539]

Answer:

510

Step-by-step explanation:

(0.68)750

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6 0

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