I need help with my mathwork

1. 4.2 x 10^-7

2. 2.9 x 10^-6

3. 7.1 x 10^-2

4. 2.56 x 10^5

least to greatest

4.2 * 10^-7

2.9*10^-6

7.1 * 10^-2

2.56 * 10^5

Step-by-step explanation:

2.56 * 10^5 =256000

4.2 * 10^-7 =0.00000042

7.1 * 10^-2 =0.071

2.9*10^-6 = 0.0000029

If they met half-way, each train traveled 360 milet s = speed of the slower trainthen(s+4) = speed of the faster train: write a time equationslow train time - fast train time = 1 hr  -   = 1multiply equation by s(s+4), cancel the denominators
360(s+4) - 360s = s(s+4)360s + 1440 - 360s = s^2 + 4sa quadratic equation0 = s^2 + 4s - 1440use the quadratic formula; a=1; b=4; c=-1440. but this will factor to: (s-36)(s+40) = 0positive solutions = 36 mph, speed of the slow trainthen obviously; 40 mph, the speed of the faster  source: