Consider a relation R with atributeset{A, B,C, D}={A→B, B→C, C→D}.This relation is decomposed into three sub relations{AB, BC, CD}. Check if the decomposition is dependency preserving or not. Discuss.{A, B,C, D}={A→B, B→C, C→D}.{AB, BC, CD}. .Discuss.

Write an essay on online collaboration, how to do it, the challenges, resolving the challenges, and consider whether the risks are greater than rewards. ( need )

Freya realizes she does not have enough in her bank account to use the debit card. she decides to use a credit card instead. which questions should freya answer before using a credit card? check all that apply. can i pay at least the minimum payment each month? can i make payments on time and avoid late fees? will i have to take out a loan? how much in finance charges can i afford to pay? should i talk to a consumer credit counseling service?

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