exam Maths Puzzle Numerical Ability

10*sq rt 7 + 8*sq rt 7 = what?

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exam Other Question

(-9)(5)
________
-3
This is supposed to be a fraction and I have no idea how to do this. Can someone please help.
Write an equation for the line containing (-4, 19) and (-2,9). I tried to do it and used the calculator on the site, but I come up with something different