exam Maths Puzzle Numerical Ability

student makes 338 points after 4 test worth 100 points. What is the least he could score for 82%. Shown as a formula. Answer is 72 Points I believe, but the corret formula is ???

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exam Other Question

Add or subtract the fractions then simplify using the Pythagorean identities and factoring to find the expression that completes the identity.

sinx/(cosx+1) + (cosx+1)/sin x

Please show me the steps. Thank you! Will someone please help me write this as a single logarithm!
1/2 ln (x^2 +1) -4 ln (1/2) -1/2[ln(x-4)+ln x]

Thank you so much, Natalie