exam Maths Puzzle Numerical Ability

The sample space of an experiment is:
{A, B, C, D} AND P(A) = 0.1, P(B) = 0.3, P(C) = 0.4, P({A,C})=

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what is the slope of the line y=5x-4? 1) 1/A=1/M+1/T solve for T
I thought my LCD was AMT but its still not coming out right.
If someone could help thanks.