PLEASE HELP on taco Tuesday mrs greenfield bought 30 tacos for $11 each and 2 drinks for $4 each Part A: write an expression for the total cost.

Part B: find the total cost
PLEASE HELP!!

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

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What are the exclude value of mn+3m