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Kazeer [188]
3 years ago
5

What is the solution to the equation 1 over 21 multiplied by x is equal to 1 over 7?

Mathematics
2 answers:
evablogger [386]3 years ago
7 0
The second one is $3.98
KengaRu [80]3 years ago
4 0
1/21x = 1/7
 x = 1/7 * 21
x = 21/7
x = 3 <===

7.96/2 = 3.98 <==

" at most 20 " = number line graph with closed circle on 20 shaded to left




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liberstina [14]

First hour: 3 = 3¹

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Fourth hour: (3 x 3 x 3) x 3 = 3⁴

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5 0
3 years ago
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Step-by-step explanation:

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3 years ago
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skelet666 [1.2K]

Answer:

This is true.

Step-by-step explanation:

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Step 2: remove parenthesis so that 2(1-3√3) becomes 2 - 6√3

Step 3: observe that the equation now becomes 6√3 + 2 - 6√3 = 2

if you simplify any further, you are left with 0=0, which is true.

Comment if there is any step that requires more details...

3 0
3 years ago
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Find the solution set of the following quadratic equations using the quadratic formula.
oksian1 [2.3K]

Answer:

<h3>                1)  x_1=\dfrac{7+\sqrt{13}}2\,,\quad x_2=\dfrac{7-\sqrt{13}}2</h3><h3>                2)   x_1=-\dfrac13\,,\quad x_2=-3    </h3>

Step-by-step explanation:

<h3>1)</h3>

x^2 - 7x + 9 = 0\quad\implies\quad a=1\,,\ b = -7\,,\ c=9\\\\x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}=\dfrac{-(-7)\pm\sqrt{(-7)^2-4\cdot1\cdot9}}{2\cdot1}=\dfrac{7\pm\sqrt{49-36}}2\\\\x_1=\dfrac{7+\sqrt{13}}2\,,\quad x_2=\dfrac{7-\sqrt{13}}2

<h3>2)</h3><h3>3x^2 + 10x=-3\\\\3x^2+10x+3=0\quad\implies\quad a=3\,,\ b =10\,,\ c=3\\\\x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}=\dfrac{-10\pm\sqrt{10^2-4\cdot3\cdot3}}{2\cdot3}= \dfrac{-10\pm\sqrt{100-36}}6\\\\x_1=\dfrac{-10+\sqrt{64}}6=\dfrac{-10+8}6=-\dfrac13\,,\qquad x_2=\dfrac{-10-8}6=-3</h3>
7 0
3 years ago
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kkurt [141]

Answer:

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Step-by-step explanation:

There is a website called calculator soup that will help you with any other problems as well. It doesnt just tell you the answer but shows work as well. :)

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