exam Maths Puzzle Numerical Ability

solve the inequality, with answer in interval notation

|2x-3| is less than or equal to 20

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exam Other Question

complete ordered pair solutions

3x+4y+12 (0,),(,34) ,(,0),(83,) Janet invested $29,000, part at 12% and part at 14%. If the total interest at the end of the year is $3,800, how much did she invest at 12%?

I am having a terrible time setting up this problem...