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15 bottles of foundation
were sold. On the second day, 18 bottles were sold, and on the third day, 21 bottles were sold.
If the number of sales followed a consistent arithmetic sequence, how many bottles of
foundation were sold over the first 45 days? Round your answer to the nearest whole number.

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Answer:

147 bottles

Step-by-step explanation:

each day is an increment of 3 bottles  day 10 was 42 bottles

day 20 was 72

safe to assume every 10 days is 30 bottles sold so day 30 is 102 and day 40 is 132 bottles

then add  3 for the remaining 5 days

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