exam Maths Puzzle Numerical Ability

(-3-5)sqrt2+(-4-2)sqrt2 this is supposed to add up to sqrt100 and then into 10 how is this problem done?

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exam Other Question

Write a polynomial function with the given zeros.
1. -1,1,1,-6
2. 2,-2,-3
3. 2,1,3
4. 2,3,-3,-1
5. 0,-8,2
6. -10,0,2
PLEASE HELP ME! I NEED TO SEE THE WORK FOR THIS TOO. THANK YOU VERY MUCH I have two questions I am so lost,

1. Find the slope for y-2x=2

2. find the slope for the line passing through (3,-1) and 1,3)

Thank you so much for any help.