What are the correct steps for solving the equation x^2-2x-15=0

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

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

The cost for an uberi is $2.50 plus $2.00 mile. if the total for the uber ride was $32.50, how many miles did the customer travel?