exam Maths Puzzle Numerical Ability

is 2 over 7 an irrational # or rational #

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exam Other Question

This problem is really confusing me. Can someone please help? Given
f(x) = -x3 + x2 + 3x + 4, find f(-1), f(0), and f(1). Thanks. Directions: In exercises 40-42, use the following information: The number of calories burned while doing an activity can be expressed by rm(rate& minute), where r is the rate of ca