book Maths Puzzle Numerical Ability

The slope is 1 ; the y-intersept is 0

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book Other Question

A computer can execute 36 instructions per microsecond. How many instructions can it execute in 4 minutes?

Thanks! How do i do this problem

(1/2y^2 z+ 3/4yz-1/8z^2)+(3/4y^2 z+3/4yz+z^2)