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saul85 [17]
4 years ago
5

Please help me out here ​

Mathematics
1 answer:
Karolina [17]4 years ago
6 0
Search on khan academy for help
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What is the answer for 3r+8=2r+12
Marina86 [1]

Answer:

r=4

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
PLSSSS HELPPP MEEEEEE
Brrunno [24]

Hi, I'm happy to help!

Parallel means that two lines are lined up in the same directions and will never intersect even if they were extended forever in directions.

Let's look at the first option of AB, and AD. We can see that both lines intersect at point A, so AB and AD are not parallel.

For the next option of CD and BE, we can see that both lines don't intersect and won't ever even if the lines were extended. So, CD and BE are parallel.

For the third option, we have BC and DE. These lines don't intersect and aren't in line to ever do so. Therefore, BC and DE and parallel.

The last option is AD and BC. These two lines will never meet, but, they aren't line up in the same directions. AD is traveling upwards while BC isn't. Think about being able to make a road out of the two lines, it would never work. AD and BC are not parallel.

<u>To sum it up: You should select the 2nd and 3rd options because those lines are parallel.</u>

<u></u>

I hope this was helpful, keep learning! :D

7 0
3 years ago
The value of a particular rookie baseball card was $2.00 when it was first printed. Five years later, when the player was at his
mash [69]

Let t be the time passed  in years and y be the value of baseball card.

You know that

  • when x=0, then y=2;
  • when x=5, then y=25;
  • when x=10, y=8.

The equation in standard form is y=ax^2+bx+c. Substitute given data into the equation:

a\cdot 0^2+b\cdot 0+c=2,\\\\a\cdot 5^2+b\cdot 5+c=25,\\\\a\cdot 10^2+b\cdot 10+c=8.

Solve the system of equations:

\left\{\begin{array}{l}c=2\\25a+5b+c=25\\100a+10b+c=8\end{array}\right.\Rightarrow \left\{\begin{array}{l}c=2\\25a+5b=23\\100a+10b=6\end{array}\right.\Rightarrow

\left\{\begin{array}{l}c=2\\a=-0.76\approx -0.8\\b=8.4\end{array}\right.

Then the parabola equation is

y=-0.8x^2+8.4x+2.

7 0
3 years ago
Read 2 more answers
What is the surface area of the prism, in square centimeters?
elixir [45]

Answer:

182

Step-by-step explanation:

2( \frac{1}{2} \times 4 \times 6 ) + 2( 5 \times 10 ) + ( 6 \times 10 )

= {182cm}^{2}

7 0
3 years ago
You want to rent an unfurnished one-bedroom apartment in Boston next year. The mean monthly rent for a simple random sample of 3
Tpy6a [65]

Answer: 99% confidence interval would be (1346.37,1553.63)

Step-by-step explanation:

Since we have given that

Sample size = 30

Sample mean = $1450

Standard deviation = $220

We need to find the 99% confidence interval.

So, z = 2.58

So, confidence interval would be

\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=1450\pm 2.58\times \dfrac{220}{\sqrt{30}}\\\\=1450\pm 103.63\\\\=(1450-103.63,1450+103.63)\\\\=(1346.37,1553.63)

Hence, 99% confidence interval would be (1346.37,1553.63)

4 0
4 years ago
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