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inn [45]
3 years ago
14

Sandra needs to earn $1300 per month in order to help her family meet their basic needs. She can only work 15 hours per week. Wh

at is the minimum amount she can earn per hour in order to meet her family's basic needs?
Mathematics
1 answer:
Finger [1]3 years ago
8 0

Answer:

The minimum amount she can earn per hours in order to meet her family's needs will approximately be $20.

Step-by-step explanation:

Sandra needs to earn $1300 per month in order to help her family meet their basic needs. Her monthly income for her to be able to take care of her family should be $1300. She can only work 15 hours in a week . The amount she can earn per hour in order to meet her family's basic needs is calculated below.

Some months has 4 weeks plus 3 days( 4.4286 weeks) while some have 4 weeks plus 2 days(4.2857 weeks ) .Only February during common year has exactly 4 weeks.

Let us use 4.345 weeks for 1 month.

if 1 week = 15 hours of work

4.345 weeks = ? hours

cross multiply

4.345 × 15 = 65.175  hours.

She works 65.175 hours in a month. The minimum amount she can earn per hours in order to meet her family's needs will be

amount per hours = 1300/65.175

amount per hours = 19.9462984273

amount per hours ≈ $20

The minimum amount she can earn per hours in order to meet her family's needs will approximately be $20.

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See attached picture.

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Please simplify picture attached
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HELP PLEASE!!! I need help with 94 if you could show the steps that would be very helpful!
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A combination is an unordered arrangement of r distinct objects in a set of n objects. To find the number of permutations, we use the following equation:

n!/((n-r)!r!)

In this case, there could be 0, 1, 2, 3, 4, or all 5 cards discarded. There is only one possible combination each for 0 or 5 cards being discarded (either none of them or all of them). We will be the above equation to find the number of combination s for 1, 2, 3, and 4 discarded cards.

5!/((5-1)!1!) = 5!/(4!*1!) = (5*4*3*2*1)/(4*3*2*1*1) = 5

5!/((5-2)!2!) = 5!/(3!2!) = (5*4*3*2*1)/(3*2*1*2*1) = 10

5!/((5-3)!3!) = 5!/(2!3!) = (5*4*3*2*1)/(2*1*3*2*1) = 10

5!/((5-4)!4!) = 5!/(1!4!) = (5*4*3*2*1)/(1*4*3*2*1) = 5

Notice that discarding 1 or discarding 4 have the same number of combinations, as do discarding 2 or 3. This is being they are inverses of each other. That is, if we discard 2 cards there will be 3 left, or if we discard 3 there will be 2 left.

Now we add together the combinations

1 + 5 + 10 + 10 + 5 + 1 = 32 choices combinations to discard.

The answer is 32.

-------------------------------

Note: There is also an equation for permutations which is:

n!/(n-r)!

Notice it is very similar to combinations. The only difference is that a permutation is an ORDERED arrangement while a combination is UNORDERED.

We used combinations rather than permutations because the order of the cards does not matter in this case. For example, we could discard the ace of spades followed by the jack of diamonds, or we could discard the jack or diamonds followed by the ace of spades. These two instances are the same combination of cards but a different permutation. We do not care about the order.

I hope this helps! If you have any questions, let me know :)








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