exam Maths Puzzle Numerical Ability

A random sample of 10 miniature Tootsie rolls was taken from a bag. Each piece was weighed on a very accurate scale. The results in grams were
3.087, 3.131, 3.241, 3.241, 3.270

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Find the zero of the linear function

f(x)=4+x

f(x)= -3x+13

Thank you*** Are the sets of lines parallel, perpendicular, or neither:
Line 1 is through (-4,-7) and (1,3) and Line 2 is through (2,6) and (4,10)
Thanks in advance