exam Maths Puzzle Numerical Ability

Given f(x)=x^2+2x+1 find f(x+h) and simplify how can i figure this out if only f is given to me and not h?

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exam Other Question

solve each of the following systems of linear equations for variables x,y,and z. You may use any method.

A.

-2x + 2y - 3z = 2
1x + 4y = 10
2x + 1y +1z = 9

B. A marketing company expects 6% of people to return surveys sent to them in the mail. Of the surveys they actually get back, 1/3 are unreadable. If the company wants to receive 200 readable surveys, how many must they mail out?