exam Maths Puzzle Numerical Ability

the values of a, b, c, and d are 1, 2, 3, and 4, but not necessarily in that order. what is the largest possible value of ab+cd+da?

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please help me solve this equation 5^4 x m =? In an aerobic exercise class, the instructor used the following equation to determain what should be her students' exercise heart rate E (in beats per min). A is the age in years: