Pinlon Math

Rodney bought 5 pens and 2 calculators for $17.60.If 2 pens and 2 calculators cost $14, find the cost of 4 such pens.

2.54 is 3.29 less than ___________________.

Jack's height is 1.89 m and Frank is 0.23 m shorter than Jack. If Sean is half as tall as Frank, how tall is Sean?

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