ziggyrules2002

ziggyrules2002

28.01.2020 •

Mathematics

What is the difference of the given values to the correct level of precision?
8.501 cm
-0.27 cm
a 8 cm
b 8.2 cm
c 8.23 cm
d 8.231 cm
x
not d

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Ответ:

savannahvargas512

29.03.2021

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18 ) Go...

(3x - 16) + (6x + 7) = 180

Collect like terms

9x - 9 = 180

Add sides 9

9x - 9 + 9 = 180 + 9

9x = 189

Divide sides by 9

$\frac{9x}{9} = \frac{189}{9} \\$

x = 21

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11y - 32 = 6x + 7

11y - 32 = 6(21) + 7

11y - 32 = 126 + 7

11y - 32 = 133

Add sides 32

11y - 32 + 32 = 133 + 32

11y = 165

Divide sides by 11

$\frac{11y}{11} = \frac{165}{11} \\$

y = 15

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19 ) Go...

8x - 14 = 5x + 34

Add sides 14

$8x - 14 + 14 = 5x + 34 + 14 \\$

8x = 5x + 48

Subtract sides 5x

- 5x + 8x = - 5x + 5x + 48

3x = 48

Divide sides by 3

$\frac{3x}{3} = \frac{48}{3} \\$

x = 16

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(5y + 16) + (8x - 14) = 180

5y + 16 + 8(16) - 14 = 180

5y + 16 + 128 - 14 = 180

5y + 130 = 180

Subtract sides 130

5y + 130 - 130 = 180 - 130

5y = 50

Divide sides by 5

$\frac{5y}{5} = \frac{50}{5} \\$

y = 10

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