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3 years ago

12

Membership to a music club costs $120. Members pay $20 per music lesson and nonmembers pay $35 per music lesson. How many music

lessons would have to be taken for the cost to be the same for members and nonmembers?

1 answer:

Shalnov [3]3 years ago

6 0

Answer:

members would take 7 lessons = 140

nonmembers would take 4 lessons = 140

Step-by-step explanation:

20 X 7 = 140

35 X 4 = 140

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Answer:

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Step-by-step explanation:

Lets call $v_p$ the the still-air speed of the plane and $v_w$ the speed of the wind. On the first part the speed of the plane relative to the ground will be $v_1=v_p-v_w$ , and on the second part it will be $v_2=v_p+v_w$ .

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Adding both equations:

$(v_p-v_w)+(v_p+v_w)=2v_p=\frac{d}{t1}+\frac{d}{t2}$

$v_p=\frac{1}{2}(\frac{d}{t1}+\frac{d}{t2})$

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If instead of adding, we substact, we would have:

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