exam Maths Puzzle Numerical Ability

simplify: i^51

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A scientist notes the bacteria count in a petrie dish is 50. Two hours later, he notes the count has increased to 80. If this rate of growth continues, how much more time will it take for the bacteria count to reach 100? the spanish club purchased 34 tacos for $40 to sell for a fundraiser . they purchased chicken tacos for a $1 each and beef tacos for $1.50 each. how many kind of taco did the spanish club purchase?