book Maths Puzzle Numerical Ability

how would you graph |x+1|=y? what does the | | mean?

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book Other Question

Jill has $3.50 in nickels and dimes. If she has 50 coins, how many of each type of coin does she have? On Saturday morning, Lynn walked for 2 hours and then ran for 30 minutes. If she ran twice as fast as she walked and she covered 12 miles altogether, then how fast did she walk?