exam Maths Puzzle Numerical Ability

(-6*x^-2*y)^-2

(9x^6)^3/2

log( base 7) (square root of 7)

log(.1)

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exam Other Question

for each pair of equations, determine if the lines are parallel, perpendicular, or neither.

y-3x=10 and 3y+x = -5

I have no idea how to start. Thank you.
Two POSITIVE NUMBERS HAVE the ratio 2:3. THE LARGER NUMBER IS 30 MORE THAN ONE-HALF OF THE SMALLER NUMBER. FIND THE NUMBER.