exam Maths Puzzle Numerical Ability

Solve the system by substitution.
x + 5y = 0
-2x - 4y = 6

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exam Other Question

A box contains one 2-inch rod, one 3-inch rod, one 4-inch rod, and one 5-inch rod. What is the maximum number of different triangles that can be made using these rods as sides? 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?