A store reduced the price of a sofa from $879.00 to $645.00.  What was the percent the sofa was decreased?  Round to the nearest percent. a
27%
b
23.4%
c
36%
d
32.4%

i think that you should ask google for the answer to that problem because if we don't know it google does

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

m∠a is 90°

m∠b is 40°