exam Maths Puzzle Numerical Ability

i cant figure this out

Emily Ling is a real estate broker who earns 12% commision on each house she sells. if she earns $21,600 on the sale fo a house, what was the selling price of the house?

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exam Other Question

Please solve the system of linear equations and check any solution algebraically.

2x+4y-z=7
2x-4y+2z=-6
x+4y+z=0

*this is what i have so far:

2x+4y-z=7
-E1+E2 A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calcul