exam Maths Puzzle Numerical Ability

WHAT IS THE AREA OF A RECTANGLE WITH A WIDTH OF 12 FEET AND A LENGTH OF 10 FEET?
WHAT IS THE PERIMETER OF A TRIANGLE WHERE THE SIDES MEASURE 6,8,AND 10 INCHES?
WHAT WOULD BE THE RADIUS OF A CIRCLE WITH A DIAMETER OF 8 INCHES?

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Solve the system by substitution.
x + 5y = 0
-2x - 4y = 6 I'm still confused on this problem. It states to simplify.

(3x+3y+3)/9x ÷ (x^2+ 2xy+y^2- 1)/(x^4+ x^2 )

My instructor states - Once you get this in the form where you are m