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UNO [17]
3 years ago
7

50 POINTS!! What is the sum of the first four composite numbers? 19 20 27 28

Mathematics
2 answers:
Nataliya [291]3 years ago
6 0

its 27

hope this helps

irina1246 [14]3 years ago
3 0

Answer:

C.27

Step-by-step explanation:

Composite number is a number that have factor other than 1 or the number itself. It is the opposite of prime number. Then to solve this question it will be easier to make this list

2= 2 *1 = prime

3= 3 *1 = prime

4= 2 *2 = composite

5= 5 *1 = prime

6= 2 *3 = composite

7= 7 *1 = prime

8= 2 *2 * 2 = composite

9= 3 *3 = composite

then 4 first composite is: 4+6+8+9= 27

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Step-by-step explanation:

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Step-by-step explanation:

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4 0
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Justin weighs 15 pounds less than Greg weighs. Half of Greg’s weight is 75 pounds less than Justin’s weight. How much does each
Alinara [238K]
The answer is:
Justin weighs 165 pounds.
Greg weighs 180 pounds.


If:
j - Justin's weight
g - Greg's weight

Then the system of equations is:
j + 15 = g              ⇒ g = j + 15
1/2g = j - 75          ⇒ j = 1/2g + 75

We can replace j in the first equation:
g = <span>1/2g + 75 + 15
g - 1/2g = 90
1/2g = 90
</span>⇒ g = 90 ÷ 1/2 = 180
<span>
Thus, Greg weighs 180 pounds.

Now, using the first equation, we will calculate Justin's weight:
</span>j + 15 = g                    ⇒ j = g - 15
g = 180

Thus 
<span>j = g - 15 = 180 - 15 = 165
</span>
Therefore, <span>Justin weighs 165 pounds.</span>
4 0
3 years ago
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