Can someone please help?

The cash price of a television is $580.the hire-purchase price of the television is $865.the hire-purchase price is an initial deposit of n% of the cash price and 6 equal monthly payments of $120.find the value of n.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

If chord ab is congruent to chord cd, then what must be true about ef and eg?