exam Maths Puzzle Numerical Ability

can anyone help me on how to solve this problem?

X^2 + y^2/ x + y

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exam Other Question

Solve each of the following systems by graphing.

2x - y = 4
2x - y = 6
Of course there is a graph below with "y" on the top middle and an "x" in the middle line (arrow). Can s For 68 days in a row, a person receives twice the number of pennies as the day before (day 1 - .01, day 2 - .02, day 3 - .04, day 4 - .08...........). What is the sum of the total 68 days?