exam Maths Puzzle Numerical Ability

solve the equation:

log x = 1 - log(X + 3)

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exam Other Question

Can someone help me on this problem?

I showed up above what book and page number the problem is on.

The cost of producing a number of items x is given by C = mx + b, in w I am needing to perform the indicated operation and express the problem in lowest terms....can you please assist? Thank you.
2ab/a2(squared)- b2(squared) - b/a-b + 2