exam Maths Puzzle Numerical Ability

y=x-5

is this function increasing, decreasing, or constant

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exam Other Question

How do I find the length x in the triangle with sides of 10, 8, x? I am supposed to express my answer in simplified radical form. How do I do this? Please help, Thanks find the equation of the line with slope 7 and y-intercept(0,-15). Write your answer in slope-intercept form.