exam Maths Puzzle Numerical Ability

Prove that for any sets A and B, if A is a subset of B, then

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exam Other Question

the question says use the diagram to solve for x

the equation is 42=3x+y and y=x+2
log7X

The exercise asks, write the espression using only natural logarithms. The other problems I worked X was given a value. What is X in this problem.