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lisov135 [29]
3 years ago
5

a student earned a grade of 80% on a math test that had 25 problems. how many problems on this test did the student answer corre

ctly

Mathematics
2 answers:
Mamont248 [21]3 years ago
6 0
80% of 25
percent means parts out of 100
'of' means multiply
80% of 25 means
80/100 times 25=40/50 times 25=20/25 times 25=20

answer is 20 problems
algol133 years ago
6 0
25×0.8= 20. just to back the other answer up
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3 years ago
A marketing firm is studying consumer preferences for winter fashions in four different months. From a population of women, 18-2
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Answer:

B) The sample size was 100

Step-by-step explanation:

Number of sample size in January = 100

Number of sample size in March   = 100

Number of sample size in June     = 100

Number of sample size in  September = 100

The average sample size for the study = (100 +100+100+100)/4  

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3 years ago
Ayuda! <br> Necesito el inciso k) por 10 puntos
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Answer:

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6 0
2 years ago
The sum of two numbers is 25 and the sum of their squares is 337. Find<br> the numbers
rewona [7]

Answer: 9 and 16

Step-by-step explanation:

Say one of the numbers is x and the other is y.

Set up a system of equations:

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Move around the first equation so that you can plug it in to the second equation.

x = 25 - y

Plug it into the second equation.

(25-y)^2 + y^2 = 337

Solve it out.

(625-50y+y^2) + y^2 = 337

625-50y+2y^2=337

288-50y+2y^2=0

Use the quadratic formula to solve for y.

y=\frac{-(-50)+\sqrt{(-50)^2-4(2)(288)} }{2(2)} \\\\y= 16\\y=\frac{-(-50)-\sqrt{(-50)^2-4(2)(288)} }{2(2)} \\\\y = 9

Now plug it in and test out the values of each.

Let's do the first one first.

x + 16 = 25\\x = 9

Wow! We can see that it is equal to the 2nd y value we produced.

But let's double check.

9^2 + 16^2 = 337

We are correct. The order of x and y doesn't matter because we can see that the two numbers are 9 and 16. Hope that helps.

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Answer:

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2 years ago
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