1. 8.EE.1.3: An expression is shown. Which one of the expressions below is equivalent?
(4x10^-8)+(2x10^-8)
(2x10^-10)
A 3 X 10^-2
B 3 X 10^18
C 3 X 10^-18
D 3 X10^2

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

29933333.33

step-by-step explanation:

step by step explanation: when u removing the parentheses and combined them that would be : x+3y-x-y=2y