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Salsk061 [2.6K]
3 years ago
6

What are the factors of 21?

Mathematics
1 answer:
Genrish500 [490]3 years ago
3 0
The factors 1 ,3 ,7 ,21
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If , find the value of 2 square root of 17-x = 2x-10, find the value of x/4.
ira [324]
2 \sqrt{17-x} =2x-10\ \ \ \ \Rightarrow\ \ \ D:(17-x \geq 0\ \ \ and\ \ \ 2x-10 \geq 0)\\.\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ x \leq 17\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \  \ \ x \geq 5\\\\.\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ D=\\\\2 \sqrt{17-x} =2(x-5)\ /:2\\\\ \sqrt{17-x} =x-5\ \ \ \Rightarrow\ \ \ (\sqrt{17-x})^2 =(x-5)^2\\\\17-x=x^2-10x+25\\\\

x^2-9x+18=0\\\\ x^2-3x-6x+18=0\\\\x(x-3)-6(x-3)=0\\\\(x-3)(x-6)=0\ \ \ \ \Leftrightarrow\ \ \ (x-3=0\ \ \ \ or\ \ \ \ x-6=0)\\\\x=3\ \notin\ D\ \ \ \ \ \ \ \ \ \ \ x=6\ \in\ D\ \ \ \Rightarrow\ \ \  \frac{x}{4} = \frac{6}{4} =1.5\\\\Ans.\  \frac{x}{4} =1.5
7 0
3 years ago
an online bookstore sells 0.8% of its books to customers. what fraction of the books are sold to customers
Orlov [11]

Answer:

4/5

Step-by-step explanation:

.8% is equal to 80%

80% of 100 is 80/100

simplified the answer is 4/5

7 0
3 years ago
A company has 12 000 employees. During the financial crisis in 2008, 2.5 % of them were retrenched
Lina20 [59]

Answer:

5610

Step-by-step explanation:

unaffected people will be (100%-2.5\%-50.75%)=46.75% of 12000:

12000\cdot 46.75\%=12000\cdot \frac{46.75}{100} =120\cdot 46.75=5610

4 0
2 years ago
HeLLLLpppPpp me please
stiv31 [10]

Answer:

5 3/4

Step-by-step explanation:

4 0
3 years ago
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The radius of a circle is a 1.6 calculate its circumference
kicyunya [14]
Write down the formula for finding the circumference of a circle using the radius. The radius is half as long as the diameter, so the diameter can be thought of as 2r. Keeping this in mind, you can write down the formula for finding the circumference of a circle given the radius: C = 2πr. In this formula, "r" represents the radius of the circle. Again, you can plug π into your calculator to get its numeral value, which is a closer approximation of 3.14.
7 0
3 years ago
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