How to break down three digit multiplication 420 ×426

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)

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