exam Maths Puzzle Numerical Ability

find the function , quation of the line, that mathmatically models the data where the imput is the year (x) and the output is the cost of the war (y)
2007 and predict for 2008
2007 cost is 442 billion

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When Frank and Mark finished milking, they found that they had 900 pounds of milk that was 2 percent butterfat. How much butterfat did they have to add to raise the butterfat content to 10 percent? please help, i get a different answer each time

find three consecutive even intergers such that the sum of the first, five times the second and four times the third is 1226.