Mathematics: 1/2r + 2(3/4r - 1) = 1/4r + 6

1/2r + 2(3/4r - 1) = 1/4r + 6 - id1223411467513909, azainababbas

Ответ:

chloeholt123

02.02.2022

$\frac{1}{2}r+2(\frac{3}{4}r-1)=\frac{1}{4}r+6\ \ \ \ \ \ \ |omit\ bracket\\\\\frac{1}{2}r+\frac{3}{2}r-2=\frac{1}{4}r+6\ \ \ \ \ \ |\cdot4\\\\2r+6r-8=r+24\ \ \ \ \ \ |combine\ like\ terms\\\\2r+6r-r=24+8\ \ \ \ \ |simplify\\\\7r=32\ \ \ \ \ |:7\\\\r=\frac{32}{7}=4\frac{4}{7}$

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Ответ:

RichardKing2376

02.02.2022

Mathematics

$\frac{1}{2}r+2(\frac{3}{4}r-1)=\frac{1}{4}r+6\\\\\frac{1}{2}r+2\times\frac{3}{4}r-2\cdot1=\frac{1}{4}r+6\\\\\frac{1}{2}r+\frac{3}{2}r-2=\frac{1}{4}r+6\\\\\frac{1+3}{2}r-2=\frac{1}{4}r+6\\\\\frac{4}{2}r-2=\frac{1}{4}r+6\\\\2r-2=\frac{1}{4}r+6\ \ \ \ \ \ |add\ 2\ to\ both\ sides\\\\2r=\frac{1}{4}r+8\ \ \ \ |subtract\ \frac{1}{4}r\ from\ both\ sides$

$1\frac{3}{4}r=8\\\\\frac{1\cdot4+3}{4}r=8\\\\\frac{7}{4}r=8\ \ \ \ \ |divide\ both\ sides\ by\ \frac{7}{4}\ (multiply\ both\ sides\ by\ \frac{4}{7})\\\\r=8\cdot\frac{4}{7}\\\\r=\frac{8\cdot4}{7}\\\\r=\frac{32}{7}\\\\\boxed{r=4\frac{4}{7}}$

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Ответ:

leslieguerrero2225

24.12.2021

Mathematics

1.2803

Step-by-step explanation:

According to the Question,

Given That, You want to invest in companies belonging to Gispa Group of 1 Companies, Inc. so you did some research and found out that companies belonging to this group have an average gain of 0.8 percent and a standard deviation of 0.7 percent. And, a positive percent (gain) means profit and a negative percent means a loss. If you choose 20 companies.

Therefore, We have Average Gain(ц) = 0.8%

Standard deviation(σ) = 0.7%

Number of Companies(n) = 20

So, the probability that the companies are gaining more than 1 percent is

$X_{i}$ = (σ² × n) / ц ⇒ (0.7²×20) / (0.8*10) = 1.2803

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1/2r + 2(3/4r - 1) = 1/4r + 6

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