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White raven [17]

3 years ago

5

a studernt has pased 60 percent of 20 quizzes he has written so far successfully. if the student 50 quizzes during the year, and

passes 80 percent of the remaning quizzes successfully what is the precent of all the successful quizzess for the entire year

1 answer:

faust18 [17]3 years ago

5 0

Answer:

72%

Step-by-step explanation:

There are a total of 50 quizzes in the year

From the first 20, the student passes 60%. This makes a total of

$\frac{60}{100} (20) = 12$

12 passes

Out of the remaining 30 quizzes the student passes in 80% of them. This makes a total of

$\frac{80}{100} (30) = 12$

24 passes

Adding the two values

12 + 24 = 36

The student passes 36 quizzes out of 50.

We convert this to a percentage

$\frac{36}{50} (100) = 72$ %

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Strike441 [17]

Answer:

49 1/6 meters

Step-by-step explanation:

P = 2(73/3) + 2(61/4)

= 146/3 + 61/2

= 48 2/3 + 30 1/2

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= 48 + 7/6

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5 0

2 years ago

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A water storage tank is in the shape of a hemisphere (half a sphere). If the radius is 20 ft, approximate the volume of the t

otez555 [7]

Answer:

The approximate volume of the tank is $V=16,747\ ft^{3}$

Step-by-step explanation:

we know that

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we have

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7 0

3 years ago

Please help? I'm. terrible at these

kykrilka [37]

13.5 = 30% of 45
4.5 = 15% of 30
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3 0

2 years ago

Find all the zeroes of the equation(with simple steps).

uysha [10]

<u>Answer-</u>

<em>The zeros are, $5,\ -5,\ 4i,\ -4i$ </em>

<u>Solution-</u>

$\Rightarrow -3x^4+27x^2+1200=0$

$\Rightarrow -3(x^2)^2+27(x^2)+1200=0$

Here,

a = -3, b = 27, c = 1200

So,

$x^2=\dfrac{-b\pm \sqrt{b^2-4ac}}{2a}$

$=\dfrac{-27\pm \sqrt{-27^2-4\cdot (-3)\cdot 1200}}{2\cdot (-3)}$

$=\dfrac{-27\pm \sqrt{729+14400}}{-6}$

$=\dfrac{-27\pm 123}{-6}$

$=\dfrac{-27+123}{-6},\ \dfrac{-27- 123}{-6}$

$=\dfrac{96}{-6},\ \dfrac{-150}{-6}$

$=-16,\ 25$

So,

$\Rightarrow x^2=25,\ -16$

$\Rightarrow x=\sqrt{25},\ \sqrt{-16}$

$\Rightarrow x=5,\ -5,\ 4i,\ -4i$

8 0

2 years ago

Ramkin is going to flip a fair coin 100 times.

Gelneren [198K]

Answer:

50 times

Step-by-step explanation:

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Please let me know if you have any more questions. Hope this helps!

3 0

2 years ago