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larisa86 [58]
3 years ago
11

Kerrie uses the work shown below to determine 35% of 280.

Mathematics
2 answers:
lys-0071 [83]3 years ago
6 0

For this case we must find 35% of 280.

Kerrie gets 10% and then 25%. So:

10% of 280:

280 ------------> 100%

x -----------------> 10%

Where "x" represents the amount given by 10% of 280.

x = \frac {10 * 280} {100}\\x = 28

Thus, 10% of 280 is 28.

Now, we find 25% of 280:

280 ------------> 100%

x -----------------> 25%

Where "x" represents the amount given by 25% of 280.

x = \frac {25 * 280} {100}\\x = 70

Thus, 25% of 280 is 70.

So we have that 35% of 280 is given by:

28 + 70 = 98

So, Kerrie's solution is correct.

Answer:

Option A

finlep [7]3 years ago
6 0

Answer:

<h2>Kerrie's solution is correct.</h2>

Step-by-step explanation:

Each step of Kerrie's solution is correct, because 10% + 25% is actually 35%. Also, 10% of 280 is 28, because we divide 280 by 10. The third step is also correct because 25% is the same as the fourth part, or divide by four, because 25% is the fourth part of 100%.

At last, the sum 70 + 28 is also correct, because it results in 98.

Basically, Kerrie made a different process, but it gives the same result. Because we only could do it like this:

\frac{35\%}{100\%}=0.35

Then, 280(0.35)= 98

As you can see, it results the same number.

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3 years ago
What are the solutions of this system of equations?
SpyIntel [72]

Answer:

Option C is correct.

Step-by-step explanation:

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We can solve by substituting the value of y in eq(2) in the eq(1)

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x^2-x+3x-3-5=0

x^2+2x-8=0

Now factorizing the above equation

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put x =2

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7 0
3 years ago
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Answer:

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Answer:

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7 0
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