- Find the equation of a circle with the centre at s(1,20) which touches the line 8x+15y+9=0?

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Please help me with chemistry? What goes into designing a bridge of great length? How to rearrange a(q-c)=d to make q the subject (im terrible at maths sorry)? Given the function f(x)=x^2lnx. State the coordinates of the x- and y-intercepts of the graph of f , if any exist.? What formula would I use to find out how long it would take a rolling ball to come to a stop on the moon?