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iris [78.8K]
3 years ago
11

In a class of 20 students ,40% are boys.25% of theboys and 50% of the girls were glasses.how many students were glassses. show w

ork
Mathematics
1 answer:
Mice21 [21]3 years ago
4 0
40% of 20 is 8 Boys
60% of 20 is 12 Girls
50% of the Girls is 6
25% of the Boys is 2
6 + 2 = 8 Students wore glasses

Hope this helps!
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jana ran the first 3.5 miles of a 5 mile race in 1/3 hour what was the rate in miles per hour for this first part of the race? e
Grace [21]
2.8 1/3 of 3.5 is .7    .7 - 3.5=2.8
4 0
3 years ago
What is the answer to 2X +1=-15
Over [174]
<span>2X +1=-15
Subtract 1 from both sides
2x=-16
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5 0
3 years ago
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Given the zeros, write the polynomial. <br> x= -1, 1+3i
tresset_1 [31]

Answer:

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Step-by-step explanation:

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3 years ago
What is the range of the following function:<br> y = 2(5^x) - 1
Orlov [11]
<h2>Hello!</h2>

The answer is:

The range of the function is:

Range: y>2

or

Range: (2,∞+)

<h2>Why?</h2>

To calculate the range of the following function (exponential function) we need to perform the following steps:

First: Find the value of "x"

So, finding "x" we have:

y=2(5^{x}-1)\\\frac{y}{2}=5^{x}-1\\\\\frac{y}{2}-1=5^{x}\\\\Log_{5}(\frac{y}{2}-1)=Log_5(5^{x})\\\\x=Log_{5}(\frac{y}{2}-1)

Second: Interpret the restriction of the function:

Since we are working with logarithms, we know that the only restriction that we found is that the logarithmic functions exist only from 0 to the possitive infinite without considering the number 1.

So, we can see that if the variable "x" is a real number, "y" must be greater than 2 because if it's equal to 2 the expression inside the logarithm will tend to 0, and since the logarithm of 0 does not exist in the real numbers, the variable "x" would not be equal to a real number.

Hence, the range of the function is:

Range: y>2

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Range: (2,∞+)

Note: I have attached a picture (the graph of the function) for better understanding.

Have a nice day!

5 0
3 years ago
What is value of the digit 5 in the number 75
ycow [4]
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The first number starting from the right is the ones, and as you keep going left, the value of each given digit becomes higher.

Since 5 is in the ones place, its value would be just 5. If it were in the tens place, it would be 50. If it were in the hundreds place, it would be 500, and so on. 

Think of it this way;

Ones is just one. If a number is in the 'ones' place, its value would be a single digit. If it were in the tens place, its value would be two digits. 
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So here's an example: 
5555

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In the tens place, you end up adding one zero, so the value of the second five to the left would be, "50"

So with that said, the value of the digit 5 in the number 75 is <em>5.

</em>
Haha, hope this cleared up any confusion, and have a <em>wonderful </em>day! :)<em>
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7 0
3 years ago
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