Plz me get the answer to these asap

which means b is less than or equal to -7

In other words, b can be -7 or it can be smaller (-8, -9, -10, etc)

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To get this answer, you simply subtract 9 from both sides. On the left side, the 9+b or b+9 will turn into b+0 or just b. On the right side, you'll have 2-9 turn into -7. This shows how becomes

Note: to graph this on a number line, you would plot a closed circle at -7, then shade to the left of the closed circle. The closed circle means "include -7 as part of the solution set".

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