Answer:
5x - 2y = -2
Step-by-step explanation:
-2x - (-7x) = -2x + 7x = 5x
y - 3y = -2y
0 - 2 = -2
Answer:
680 cm
Step-by-step explanation:
There are 100 cm in 1 m, so multiply 6.8*10, which equals 680
hope this helps :)

If two fractions have the same numerator, the fraction with the smaller denominator is bigger.

3/8 is bigger.
4500 meters. You find this by adding 1/3 and 2/5 which equals 11/15. This means that the remaining 4/15 is 1200 meters long. Divide 1200 by 4 in order to find the distance per 1/15 and you get 300. Multiply 300 with 15 to get the total distance of the race.