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AfilCa [17]
3 years ago
9

does anyone know this ?? pls help its a test !!! i'll give u brainliest and 15 points !! pls show work

Mathematics
1 answer:
saul85 [17]3 years ago
7 0

Answer:

DBC = 50 degrees

Step-by-step explanation:

180 - 80 = 100

2x = 100

divide by 2

x = 50

so

DBC = 50 degrees

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change decimals to fractions (0.5=1/2)

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multiply 1/5 by each term in parentheses

(1/5*3x) + (1/5*-1/2) + 1/6= x/5 + 1/2
multiply within parentheses

3x/5 - 1/10 + 1/6= x/5 + 1/2

need a common denominator; all denominators go into 30

18x/30 - 3/30 + 5/30= 6x/30 + 15/30
combine like terms

18x/30 + 2/30= 6x/30 + 15/30
subtract 6x/30 from both sides

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subtract 2/30 from both sides

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multiply both sides by 30 to eliminate fractions

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12x= 13
divide both sides by 12

x= 13/12 or 1.083333


ANSWER: x= 13/12 or 1.083333

Hope this helps! :)
7 0
3 years ago
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Brianna bought a compact disk for $10. An instant rebate gave her a discount and she only had to pay $7.50 for the CD. What is t
svetoff [14.1K]

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What is the sum of the interior angles of the polygon shown below
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What is the average cost of 7 articles if 3 of them cost 30k each and the rest cost 12.5k each ​
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{\bold{\red{\huge{\mathbb{QUESTION}}}}}

what is the average cost of 7 articles if 3 of them cost 30k each and the rest cost 12.5k each

\bold{ \red{\star{\blue{GIVEN }}}}

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ARTICLES FOR 30K = 3

ARTICLES FOR 12.5K = 7-3= 4

\bold{\blue{\star{\red{TO \:  \: FIND}}}}

Average cost of 7 articles

\bold{  \green{ \star{ \orange{FORMULA \:  USED}}}}

\red{AVERAGE  =  \frac{TOTAL \:  COST}{ NUMBER  \: OF\: ARTICLES }}

\huge\mathbb{\red A \pink{N}\purple{S} \blue{W} \orange{ER}}

Average \:  cost  \: of  \: 7  \: articles -  >  \\  \frac{(3 \times 30k) + (12 .5k \times 4)}{7}  \\  \frac{90k + 50k}{7}  \\  \frac{140k}{7}  \\  \blue {Average \:  cost  \: of  \: 7  \: articles -  >} \\ 20k

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Step-by-step explanation:

This is what I got in the calculator

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