book Maths Puzzle Numerical Ability

Evaluate e + 2f - g when e = -2, f = 4, g = -6

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Can someone please help me solve this problem. I already sent it yesterday, but did not get a response. Thanks in advance.

Suppose you invest $12,000 in two funds paying 10.5% a
What is the slope of the line that passes through (-8,7) and (5,-2)
I thought that the slope was 3, but I just redid the problem and got a completely different answer. could you p