Use the Geometric series sum formula to calculate the sums:
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Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?

What is the absolute value of -100000000000000?