PLZZZ HELP ILL MARK BRAINLIEST TO FIRST AND CORRECT ANSWER THAT HAS WORK AND A THX TO SECOND AND CORRECT ANSWER.

decagon has total 1440° interior angles.

Explanation:

using the formula to find total interior angle: ( n -2 ) * 180

                                                    where n is the number of sides

Here given the number of sides is 10

using the formula:

 ( 10 - 2 ) * 180

  1440°

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step-by-step explanation:

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.