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timurjin [86]
3 years ago
12

Find m(angle) ABC21 1324819

Mathematics
2 answers:
Studentka2010 [4]3 years ago
7 0

m<ABC and m<ABD are supplementary angles and as you know sum of supplementary angles = 180°

so m<ABC + m<ABD =  180°

3x - 9 + 7x - 1 = 180

Combine like terms

10x - 10 = 180

Add 10 to both sides

10x = 190

Divide both sides by 10

x = 19

Plug in x = 19 into 3x - 9 to find m<ABC

m<ABC = 3x - 9 = 3(19) - 9 = 57 - 9 = 48

Answer

m<ABC  = 48°

Brut [27]3 years ago
5 0

I don't like these algebra problems which pretend to be geometry.

These are supplementary angles adding to 180 degrees; geometry done.

7x - 1  + 3x - 9 = 180

10 x = 190

x = 19

ABC=3x - 9 = 3(19) - 9 = 48

Answer 48°


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2 years ago
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Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.

Numbers (constants), variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbols, which can also be used to indicate the logical syntax's order of operations and other features.

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