Numerical expressions, one half the sum of nine and three

What is the effect on the graph of the parent function f(x) = x when f(x) is replaced with 3f(x)? a) shifts the line 3 units up b) shifts the line 3 units down c) increases the slope of the line by a factor of 3 d) decreases the slope of the line by a factor of 3

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Write the expression as a single natural logarithm. 2 in a - 4 in y