Math help please I have no idea how to solve this it’s confusing me I searched a video and I’m still confused :(

57°

Step-by-step explanation:

A triangle's angles should all add up to 180°

So you have to add up the other two given angles, so in this case it is 60° + 63°, which equals 123°. Then you subtract 123 ° from 180°, giving you the answer of 57°.

it's 57

Step-by-step explanation:

the 3 angles add up to 180 so add the 2 angles together to get 123 and then subtract that from 180

i believe the answer is the polygon, heptagon.

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