book Maths Puzzle Numerical Ability

Jean, Carol, and Linda were on a committee to compile and staple the pages of their club newsletter. Each worker could have done the job alone in 4 h. Jean started at 3:30 P.M., Ca

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Radical expressions
Three students were asked to simplify sqrt10 +sqrt50. Their answers were:
Sqrt10(1+sqrt5),
Sqrt10+5sqrt2, and
Sqrt2(5+sqrt5).
Which if any is correct?
Which is in simplest form?
Thanks so much Find the equation of the line passing through the points (-3,8) and (-4,-5)

A) y=13x-47
B) y=13x+47
C) y=13x-31
D) y= -13x-31