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Total original length = 12 + 15 + 9 + 18 = <<12+15+9+18=54>>54 minutes
Day 3: +225 km (half of 450 = 225 east)
An aerospace engineer designs a rocket with three stage efficiencies: Stage 1 uses 40% of total fuel, Stage 2 uses 35%, and Stage 3 uses 25%. If Stage 1 uses 8,000 liters, how many liters does Stage 3 use?
Total after Week 3 = 12,000 + 14,400 + 17,280 = <<12000+14400+17280=43680>>43,680
An ornithologist uses radar to track flocks of birds. On day one, she detects 180 birds; day two sees a 30% increase, and day three drops by 25% from day two. How many birds were detected on day three?
Total subscribers = 5,000 + 7,000 + 9,500 = <<5000+7000+9500=21500>>21,500
An ornithologist models bird population growth. A colony starts with 250 birds. Each year, the population increases by 12%, but 20 birds are lost annually due to migration. What is the population after two years?
Use the formula for the sum of squares:
How many of the 50 smallest positive integers are congruent to 3 (mod 7)?
What is the smallest four-digit number that is divisible by 11 and whose digits sum to a multiple of 3?
