exam Maths Puzzle Numerical Ability

1) Give the three equtions that would find the temperatures at x1, x2, x3 shown in the figure below, if the temperature of each interior point is the average of its four neighborin

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exam Other Question

Factor completely

(M + N)x2nd power - 6x(M + N) + 8(M + N) Please Help,
What is the product of 2Radical 7 + 3 radical 5 and is conjugate?

also
Solve the following equations:
a) 4 + radical x+1 = 5

b) 2/7 = 5/3x-1

c) c-7/c+2 = 1