PLEASE HELP! college algebra

Given the following piecewise function
f(x)= {-x+1 for x < 0
{-1 for 0 ≤ x ≤ 3
{-2x for x > 3

a) Find the domain
b) Find the range
c) Find the intercepts
d) Is f continuous on its domain? If not, state where f is discontinuous.
e) Graph the function

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  1. the magnitude of dot and products of two vectors are 6 ander root 3 and 6 respectivly9.find the angle between the vectors.

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