exam Maths Puzzle Numerical Ability

Mutiply and simplify:

(4-3 square root 2) (5+2 square root 2)

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how do you solve 2x+25=12 jan invested $1200 at a certain simple interest rate and $2200 at a rate 3% higher. her annual earnings were $253. find the two interest ratesif earned $121 more on the larger inve