How much less than 3x^2 - 7x + 9 is 2x^2 + 4x - 8

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Fiona races bmx around a circular dirt course. if the radius of the course is 70 meters, what is the total distance fiona covers in two laps of the race? a. about 30,772 meters b. about 15,386 meters c. about 879.2 meters d. about 439.6 meters e. about 219.8 meters23 points hurry

The areas of two similar triangles are 72dm2 and 50dm2. the sum of their perimeters is 226dm. what is the perimeter of each of these triangles?