a)For the sequence -1, -7, -13, -19, -25, ... the formula for the sequence is : a¡= L; i= 1, 2, 3, ... 100 ? b)For the sequence 2, 6, 18, 54, 162, the formula for the sequence is : a¡=- .... ; i=0, 1, 2, 3, .. What is E20 a; ? 100

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A: Since you have asked multiple question, we will solve the first question for you. If you want any…

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Q: 30) Translate the following phrase into mathematical expressions. Use x to represent "a number." a.…

A: The phrases are “a) the product of a number and 12” and “b) ten times a number subtracted from 21”.