book Maths Puzzle Numerical Ability

in the formula c=sqrt of(2a squared+b squared). a=4 and b=5.my answer was 7.550? is this correct.

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book Other Question

Solve the equation for the indicated variable:

y^2-ay+10by-10ab=0 for y
Please help me.
2) Use the geometric sequence of numbers 1, 3, 9, 27, … to find the following:
a) What is r, the ratio between 2 consecutive terms?
Answer:
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