book Maths Puzzle Numerical Ability

can you help me with a=ptprt;p i keep getting a really wierd answer

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book Other Question

Find the x-intercepts of the graph of the quadratic function y equals x squared plus 4x minus 50. 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?