book Maths Puzzle Numerical Ability

I really really need help with this one

find the measure of the fourth angle of a quadrilateral when the other three angles measure 102 degrees 84 degrees and 67 degrees

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book Other Question

what is 8s+9=7s-21 Leila needs to make a poster that is 1m by 4.5m for the big game. the cost of the paper is $3.75. Later she needs another poster with dimensions 0.5m by 2.25m. What is the paper for this poster likely to cost?