90 one's are equal to 9 tens
here is the formula. i hope this will help you
Answer:
2(1.75+3.00) and 3.50x+6.00
Step-by-step explanation:
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If every single student met one an another, then you would hear 90 hi's. Since there are 45 different combinations of 2 students meeting another, and since there are 2 hi's each meeting, there would be 90.
I hope that this helps.
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