exam Maths Puzzle Numerical Ability

Using the form y=mx+b,find the equation for ;The line thru the orgin that is perpendicular to the line through (-3,0) and(0,- 3)

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exam Other Question
f(x)=x squared 2 - 4x+3

a) find domain and range of th function
b)determine if it is odd,even or neither. justify your answer.
c) sketch graph Please help me. I am having problem with this question.

1. If the diameter of a circle is 1.3 * (10)^-12 meters, then wha is the radius?

Thank you kindly.