Answer:
30
Step-by-step explanation:
Tye answer is 30 because all the measures in a triangle are equal to 180 degrees. That would equal 30 + 60 + 90 = 180
10 students averaged 80, so the sum of their scores was (10 x 80) = 800
20 students averaged 89, so the sum of their scores was (20 x 89) = 1,780
All together, the sum of all 30 scores was (800 + 1,780) = 2,580
30 students totaled 2,580, so their average was (2,580 / 30) = <em> 86</em> .
Answer:
what do you need help with
The answer is 19.9 centimeters. Hope this helps!!!
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