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LenaWriter [7]
3 years ago
5

Hi only 1 and explain please thanks

Mathematics
1 answer:
iragen [17]3 years ago
7 0
You has to make the botom number the same

to change the bottom number and maintain the same value of the fraction you has to multiply by 1 or x/x wher x=x

so
bottom numbers are 7 and 3
make them 21 by mutliply 5/7 by 3/3 and multiply -1/3 by 7/7

5/7 times 3/3=15/21
-1/3 times 7/7=-7/21
now we can do
15/21-7/21=(15-7)/21=8/21
answer is 8/21
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Suppose that you currently own a clothes dryer that costs $25 per month to operate A new efficient dryer costs $590 and has esti
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Answer:

After 59 months the new dryer will pay for itself.

Step-by-step explanation:

Let the new clothes dryer takes 'x' months to pay for itself.

Then the operating cost of the new dryer will be = 15x

Since cost of the new dryer = $590

So, total cost of the dryer in x months = $(590 + 15x)

Now we know old dryer's operating cost is = $25 per month

So, operating cost for x months = 25x

By the time when new dryer's total cost becomes equal to the old dryer's operational cost, the new dryer will pay for itself.

Now we can get the value of x by equating the old dryer's operational cost and the new dryer's total cost.

25x = 590 + 15x

25x - 15x = 590

10x = 590

x = \frac{590}{10}

x = '59 months'

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3 years ago
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Traci wants to buy rings that cost 50$ each. A jewler is offering a deal in which you buy 1 ring and get the 2nd for 25% off and
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6 0
3 years ago
Read 2 more answers
NEED HELP PLZ
Angelina_Jolie [31]

Answer:

0.14

Step-by-step explanation:

From the question given above, the following data were obtained:

Grade A = 5

Grade B = 10

Grade C = 15

Grade D = 3

Grade F = 2

Sample space (S) = 35

Probability of getting grade A, P(A) =?

The probability that a student obtained a grade of A can be obtained as follow:

Probability of getting grade A, P(A) =

Event of A (nA) / Sample space, (nS)

P(A) = nA/nS

P(A) = 5/35

P(A) = 0.14

Thus, probability that a student obtained a grade of A is 0.14

6 0
3 years ago
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