A piano teacher charges students $20.25 each month, plus $5.25 per hour for lessons. Which expression and value represent the total the instructor will charge a student for hours of lessons in a month
and the amount the instructor would charge a student for 15 hours of lessons in a month?
$20.25 -2; $15
$20.25 +x: $25.50
O $20.25 - $5.25x; $58.50
O $20.25 + $5.25x; $99

The answer should be D. $20.25+$5.25x; $99

Step-by-step explanation:

y=mx+b

m=$5.25

x=15

b=$20.25

This gives us:

5.25x + 20.25

5.25(15)+20.25

78.75+20.25

y=99

20.25 + 5.25x ; 99

Hope this helps!

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