book Maths Puzzle Numerical Ability

What is the sum of the first ten positive integers?
a)50
b)55
c)95
d)100

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book Other Question

I have been working on this problem for a week and I still can't figure it out. This is what I have so what am I doing wrong?

Let the function f be defined by f(x) = 1/(sqrt1-x^ find the x-intercept and y-intercept of the line 5x-10y=8