exam Maths Puzzle Numerical Ability

can 3 planes intersect in exactly one point?

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exam Other Question

Solve the system by addition or substitution.
-4x + 2y = -12
y = 2x - 7 How many gallons of a plant food that is 9% nitrogen must be combined with another plant food that is 25% nitrogen to make 10 gal. of a solution that is 15% nitrogen?