5years from now a father's age will be three times his son age in five years ago he was 7 times as old as his son was what are their present ages

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Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earned $75 in interest.how much interest will she earn during the following year?

What is the remainder when 3x^2-x-10 is divided by x-1 -6,-7,-8, or -9