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3 years ago

100 POINTS!!!! PLEASE HELP ASAP!!! EXPLANATION WOULD BE GREATLY APPRECIATED!

Mathematics

1 answer:

Dmitrij [34]3 years ago

5 0

Answer:

1) B- Substitution

2) C- Elimination

3) A- Graphing

Step-by-step explanation:

x+3y=7

5x+11y=3

x = 7 - 3y

Plug this x into the second equation and solve for y first

5x-3y=3 --> (1)

2x+7y=6 --> (2)

Since making any variable the subject would involve fractions, it's better to go for elimination

7(1) + 3(2)

would eliminate y

While comparing cost and adjusting choices, a graph is a better approach because all the possibilities are right in front

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Use geometric series to find the fraction of 0.8967898989

Sliva [168]

I'm guessing the repeating part is 89 at the end, so that

$x=0.8967\overline89\implies10^4x=8967.\overline{89}$

Then

$10^4x=8967+\displaystyle89\sum_{i=1}^\infty\frac1{100^i}$

$10^4x=8967+89\left(\dfrac1{1-\frac1{100}}-1\right)$

$10^4x=8967+\dfrac{89}{99}$

$x=\dfrac{8967}{10^4}+\dfrac{89}{99\cdot10^4}$

$x=\dfrac{443911}{495000}$

###

An arguably quicker way without using geometric series:

$10^4x=8967.\overline{89}$

$10^6x=896789.\overline{89}$

$10^6x-10^4x=887822$

$x=\dfrac{887822}{10^6-10^4}=\dfrac{443911}{495000}$

8 0

3 years ago

Can anyone please help me out? I have to find the Greatest Common Factor for each, thank you!

CaHeK987 [17]

Answer:

1= 4x^2

2= 5b^4

3= 3u^2v^2w

4= 7

5= bc^3d^6

Note: ^ stands for exponents

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3 years ago

Emily has 2 coins. If Emily flips both the coins at once, how many possible outcomes are in the sample space?

liberstina [14]

Answer:

I think it's 4 and why do I have to write 20 letters?

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3 years ago

Samuel rides his bike 14 blocks from his house to get to the bus stop. Then he takes the bus another 34 blocks to get to work. A

ludmilkaskok [199]

Answer: 96 blocks

Step-by-step explanation:

14 + 34 = 48 blocks

48 + 48 = 96 blocks

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2 years ago

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3 years ago