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3 years ago

Identify the mistake:

2 answers:

6 0

He added 6x when it was moved across instead of subtracting 6x. so it should say -3x = 18 not 9x=18

im one brainliest answer away from being promoted, i would appreciate it if you gave it to me it would mean so much.

Andrews [41]3 years ago

4 0

Should have subtracted 3x

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What's the slope of this chart?

Katen [24]

Answer:

y= -2/7x +4

Step-by-step explanation:

7 0

3 years ago

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Your car gets 15 miles to the gallon and your friend's car gets 25 miles to the gallon. you decide to go on a road trip to virgi

sergij07 [2.7K]

You would save $32 if you used your friends car.

I found this out by doing this:

300/15 will tell you how many gallons of gas it would take to get to Virginia Tech in your car(20 gallons). You would then multiply that by the price of gas($4), which would = $80.

300/25 will tell you how many gallons of gas it would take to get to Virginia Tech in your friends car(12 gallons). You would then multiply that by the price of gas($4), which would = $48.

So to come up with the difference you would do $80-$48, which is $32.

I hope this helped Tinytoonjr6552!

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3 years ago

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A biologist observed that a certain bacterial colony obeys the population growth law and that the colony triples every 4 hours.

MrRa [10]

Answer:

a) $P(t) = 2e^{0.275t}$

b) 54.225 square centimeters.

c) 2.52 hours

Step-by-step explanation:

The population growth law is:

$P(t) = P_{0}e^{rt}$

In which P(t) is the population after t hours, $P_{0}$ is the initial population and r is the growth rate, as a decimal.

In this problem, we have that:

The colony occupied 2 square centimeters initially, so $P_{0} = 2$

The colony triples every 4 hours. So

$P(4) = 3P_{0} = 6$

(a) An expression for the size P(t) of the colony at any time t.

We have to find the value of r. We can do this by using the P(4) equation.

$P(t) = P_{0}e^{rt}$

$6 = 2e^{4r}$

$e^{4r} = 3$

Applying ln to both sides, we get:

$4r = 1.1$

$r = 0.275$

$P(t) = 2e^{0.275t}$

(b) The area occupied by the colony after 12 hours.

$P(t) = 2e^{0.275t}$

$P(12) = 2e^{0.275*12}$

$P(12) = 54.225$

(c) The doubling time for the colony?

t when $P(t) = 2P_{0} = 2*2 = 4$ .

$P(t) = 2e^{0.275t}$

$4 = 2e^{0.275t}$

$e^{0.275t} = 2$

Applying ln to both sides

$0.275t = 0.6931$

$t = 2.52$

4 0

3 years ago

Need to know asap!! thanks

PolarNik [594]

Answer:

628 9/16 m

Step-by-step explanation:

distance = (100)(2)(22/7) = 628.57 m or 628 9/16

6 0

3 years ago

Tv=10x-26 and vx =5x+9 what is the value of x

Lyrx [107]

Since this is an equilateral triangle, TV=VX. You can set TV equal to VX to solve for the value of x. The expression would be 10x-26=5x+9. Subtract 5x from both sides to get 5x-26=9. Add 26 to both sides to get 5x=35. Lastly, divide by 5 to get x=7.

So, your answer would be 7 degrees. Hope this helps!

6 0

3 years ago

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