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WARRIOR [948]
2 years ago
11

30% of the students in a class score an A on the last test. There are 50 students in the class. How many students scores an A on

the test?​
Mathematics
1 answer:
JulijaS [17]2 years ago
4 0
<h3>Answer:</h3>

15

<h3>Step-by-step explanation:</h3>

Percentages represent a proportion of a number. There are 2 ways to find a percent of a whole number.

Multiple of 10

Since 30% is a multiple of 10%, there is a shortcut we can use. We can find 10% and then multiply by 3 in order to find 30%. First, find 10% of 50. Like always, 10% of any number is that number divided by 10 (move the decimal 1 place to the left).

  • 50/5 = 10

So, 10% of 50 is 5.0.

Then, to find 30%, multiply 5 by 3.

  • 5*3 = 15

30% of 50 is 15.

Multiplication

The more consistent method includes multiplication, this can be used with any percentage. To use this method we need to convert 30% to a decimal. To convert any percentage to a decimal divide by 100 (move the decimal 2 places to the left).

  • 30% / 100 = 0.30

Now, we can multiply this decimal by the whole number, 50. This will give us our desired answer.

  • 0.30*50 = 15

So, this once again shows that 30% of 50 is 15.

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Vera_Pavlovna [14]

Complementary angles = 90

x+y =90

y=x+24

substitute this in to the equation

x+x+24=90

2x+24=90

subtract 24 from each side

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divide by 2

x=33

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Answer: 33, 57

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3 years ago
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coldgirl [10]

Answer:

a = 9, b = 3, c = 0

Step-by-step explanation:

f(x) = (1/3)^x

a = f(-2) = (1/3)^-2= 9

b = f(-1) = (1/3)^-1 = 3

c = f(0) = (1/3)^0 = 1

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3 years ago
If f(x) = 3x 2 + 5x, find f(-2).
kipiarov [429]

Answer:

f(- 2) = 2

Step-by-step explanation:

To evaluate f(- 2), substitute x = - 2 into f(x)

f(- 2) = 3(- 2)² + 5(- 2) = (3 × 4) - 10 = 12 - 10 = 2

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3 years ago
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Find the 7th term of the geometric sequence with the given terms.
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The common ratio is the fifth term divided by the fourth term: -40/-8 = 5.
The seventh term is :
a_{7}=a_{5}\times5\times5=-40\times5\times5=-1000
8 0
3 years ago
Winston wants to find The volume of a cube. He uses the formula of volume of a cube V =s^3, where S is the length of one side of
AleksandrR [38]

Answer:

Step-by-step explanation:

if the volume is V=s^3

Winston has to do

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