exam Maths Puzzle Numerical Ability

In the sum of the expression 7 + 77 + 777 + 7777 + ... + 7,777,777,777,777,777,777, what will the digit in the tens place be?

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exam Other Question

How do I find the domain and the range for the function f(x)=ex
and express both in interval notation.

NOTE: the (x) following the (e) should be written like expanded notation, I just do not know how to do that on the computer. Factoring Trinomials by Trial and Error
18x^3y+36x^2y-32xy