book Maths Puzzle Numerical Ability

summation of 1^2+2^2+3^2+......+x^2

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book Other Question

plot the graph of the following function and what is the range:

y=5/x, domain = {x: 0.4 less than or equal to x less than or equal to 10}
The instruction says, find the measure of the third angle of each triangle in which the measures of two angles of the triangle are given.

38 degrees, x degrees