exam Maths Puzzle Numerical Ability

Write an equation for the line contaning the indicated points.
(-4,-4) and (-3,-3)

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exam Other Question

Rationalize the denominator. Assume that all expressions under radicals represent positive numbers:
(sqrt(r) - sqrt(s))/(sqrt(r)+sqrt(s))

Thank you so very much~ (cos250*cos25) + (sin250*sin25)

a.k.a. (the cosine of 250 degrees multiplied by the cosine of 25 degrees) plus (the sine of 250 degrees multiplied by the sine of 25 degrees)