exam Maths Puzzle Numerical Ability

A professor grades homeowrk by randomly checking 7 of the 20 problems assigned. in how many different ways can this be done?

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exam Other Question

Over what interval of the domain is this function decreasing: f(x) = x + 4?
@ This linear function is always increasing; m > 0. Identify intervals on which a function increases, d
find each product

(x-y)(x²-xy+y²)