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PSYCHO15rus [73]
3 years ago
13

I need help with number 7

Mathematics
1 answer:
statuscvo [17]3 years ago
8 0
It's an equilateral triangle. So from what I can see the measure of angle D will be 60 because 60+60+60=180 and they are all congruent so it should be 60.
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 Your question: Find D in | - 2d|<10

==========================================================

SOLVING....

Solve the absolute value

|−2d| < 10

     =

−2d < 10

    or

−2d > −10

Solve −2d < 10 for D

Divide each side by -2

-2d ÷ -2 < 10 ÷ -2

d > -5

Now Solve −2d > −10

Divide each side by -2

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So D is d < 5  and d > -5

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