6+5+11+15=37
so she sold 37 cups of lemonade in 4 hours
Answer:
Step-by-step explanation:
Multiply 3.5 and 2 together, obtaining 7.
Then add the exponents -6 and -4, obtaining -10.
The product is thus 7·10^(-10), or, after simplification,
7·10^(-9), or
7
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10^9
949
