exam Maths Puzzle Numerical Ability

factor completely:
7x^2+49x+42

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exam Other Question

The endpoints of segment FG have coordinates F(1/2a,-b) and G(a,1/4b). What is the expression for the length of the segment?
I think it is :
a) 1/4sqrt4a^2-25b^2 or
b) 1/4sqrt4a the average score for a class on test 1 was 88. the average score for test 2 was 77. what was the percent decrease in the average score from test 1 to test 2?