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> .
The answer is C 210 pi cm^3. Hope this helps
The answer to that problem si 6-25+2x
Answer:
A
Step-by-step explanation:
the answer is A I think
