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zheka24 [161]
3 years ago
6

Solve the equation for r. 2x+34=4(x+5)

Mathematics
2 answers:
Rainbow [258]3 years ago
6 0

Answer:

7=x

Step-by-step explanation:

2x+34=4(x+5)

2x+34=4x+20

-2x       -2x          

34=2x+20

-20      -20

14=2x

/2   /2

Snezhnost [94]3 years ago
6 0

Answer:

12.5

Step-by-step explanation:

2x+34=4(x+5)

2x+34=4x+9

*2x        -2x

34=2x+9

34-9

25=2x

25/2

12.5

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<span>From the message you sent me:

when you breathe normally, about 12 % of the air of your lungs is replaced with each breath. how much of the original 500 ml remains after 50 breaths

If you think of number of breaths that you take as a time measurement, you can model the amount of air from the first breath you take left in your lungs with the recursive function

b_n=0.12\times b_{n-1}

Why does this work? Initially, you start with 500 mL of air that you breathe in, so b_1=500\text{ mL}. After the second breath, you have 12% of the original air left in your lungs, or b_2=0.12\timesb_1=0.12\times500=60\text{ mL}. After the third breath, you have b_3=0.12\timesb_2=0.12\times60=7.2\text{ mL}, and so on.

You can find the amount of original air left in your lungs after n breaths by solving for b_n explicitly. This isn't too hard:

b_n=0.12b_{n-1}=0.12(0.12b_{n-2})=0.12^2b_{n-2}=0.12(0.12b_{n-3})=0.12^3b_{n-3}=\cdots

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