Slove by square roots :2x^2+11=131

Step-by-step explanation:

2x²+11=131

2x²=131-11

2x²=102

x²=102

2

x²=51

x=√51

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