exam Maths Puzzle Numerical Ability

Help!!! I dont understand proofs at all-can you tell me some tricks???

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exam Other Question

Solve the following system of linear inwqualities by graphing.
3x+4y<12
x+3y<6
x>0
Y>0 genetic problems, dihybrid crosses:
In cats, the genes that cause black and orange-tiger fur color are sex-linked and are incompletely dominant. The gene that causes white spots i