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2 September, 00:36

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 x 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 - x; $15

$20.25 + x; $25.50

$20.25 - $5.25x; $58.50

$20.25 + $5.25x; $99

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Answers (2)
  1. 2 September, 02:00
    0
    99$

    Step-by-step explanation:

    you take the 5.25$ per hour and multiply it by the 15 hours, and then you add the 20.25$ per month
  2. 2 September, 04:20
    0
    suppose the number of 2 hours lessons are x and 1 hour lessons are y; thus,

    2x+y=25

    50x+30y=690

    to get the values of x and y we solve the quadratic equation given;

    from the top equation:

    y=25-2x ... i

    substituting i in our second equation we get:

    50x+30 (25-2x) = 690

    50x+750-60x=690

    -10x=-60

    thus;

    x=6

    hence we conclude that the number of 2 hours classes are 6 hours
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