What is the difference of the fractions? Use the number line and equivalent fractions to help find the answer

The floor plan of a room has a scale of 2.5 in.: 35 ft. in the drawing, the length of the room is 8 in. and the width of the room is 6 in. what is the perimeter of the actual room?

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

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).