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4 years ago

NEEEDDD HELPPP PLEEASEEE MATHHHHHH HATESS MEEE!!!!!!

Mathematics

2 answers:

Vladimir [108]4 years ago

4 0

Im not sure but i think the answer is b

mars1129 [50]4 years ago

3 0

No, the answer is D and I am 100% sure.

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A colony of bacteria is grown under ideal conditions in a laboratory so that the population increases exponentially with time. A

Naddik [55]

Answer:

Initial bacterias = 6006000

Altought I believe is safe to assume that the values were 192,000 and 384,000 instead of 192,192,000 and 384,384,000, in that case the initial bacterias is 6000

Step-by-step explanation:

A exponential growth follows this formula:

Bacterias = C*rⁿ

C the initial amount

r the growth rate

n the number of time intervals

Bacterias (55 hours) = 192,192,000

Bacterias (66 hours) = 384,384,000

$Bacterias(55hours)=C*r^{{\frac{55-t}{t}}} \\Bacterias (66hours) = C*r^{\frac{66-t}{t}}}$

If you divide both you can get the growth rate:

$\frac{Bacterias (66hours)}{Bacterias(55hours)}=\frac{C*r^{\frac{66-t}{t}}}{C*r^{{\frac{55-t}{t}}}} \\\frac{384,384,000}{192,192,000} =r^{\frac{66-t}{t} -\frac{55-t}{t} } \\2 =r^{\frac{11}{t}}$

So with that r = 2 and each time interval correspond to 11 years

Then replacing in one you can get the initial amount of C

$Bacterias (55hours)=C*2^{\frac{55-11}{11} } 192,192,000 = C*32\\C= 6006000$

7 0

3 years ago

What is the area of a polygon with vertices of (-2,-4), (4,-4), (4, 4), and (-5, 4)?

inessss [21]

Answer: 60 square units

Step-by-step explanation: i hope that helps buddy :)

4 0

2 years ago

Find the equation of the line using the point-slope formula. Write the final equation using slope-intercept form. (1,2) with a s

Lilit [14]

Answer:

$y-2=\displaystyle -\frac{3}{4}(x-1)$

$y=\displaystyle -\frac{3}{4}x+\frac{11}{4}$

Step-by-step explanation:

Hi there!

Point-slope form: $y-y_1=m(x-x_1)$ where m is the slope of the line and $(x_1,y_1)$ is a given point

Given that the slope is -3/4, we can plug it into $y-y_1=m(x-x_1)$ as m:

$y-y_1=\displaystyle -\frac{3}{4}(x-x_1)$

We can also plug in the given point (1,2):

$y-2=\displaystyle -\frac{3}{4}(x-1)$

Slope-intercept form: $y=mx+b$ where m is the slope and b is the y-intercept (the value of y when the line crosses the y-axis)

To write the equation in slope-intercept form, isolate y:

$y-2=\displaystyle -\frac{3}{4}(x-1)\\\\y=\displaystyle -\frac{3}{4}(x-1)+2\\\\y=\displaystyle -\frac{3}{4}x+\frac{3}{4}+2\\\\y=\displaystyle -\frac{3}{4}x+\frac{11}{4}$

I hope this helps!

8 0

3 years ago

What is 10+3c+5d-7c+d

kumpel [21]

Hey!

To simplify the equation provided we must first start off by grouping like terms.

Original Equation :
10 + 3c + 5d - 7c + d

New Equation {Grouped Like Terms} :
3c - 7c + 5d + d + 10

Now we add similar elements.

Old Equation :
3c - 7c + 5d + d + 10

New Equation {Added Similar Elements} :
-4c + 5d + d + 10

Next we add the other similtar elements.

Old Equation :
-4c + 5d + d + 10

New Equation {Add Similar Elements} :
-4c + 6d + 10

So, this means that the equation 10 + 3c + 5d - 7c + d simplified is -4c + 6d + 10.

Hope this helps!

- Lindsey Frazier ♥

4 0

4 years ago

Read 2 more answers

Please help . 20 points for right answer

siniylev [52]

You would add up the percentages first, which would bring everything up to 35%. You would then take the original cost of the item, which is $30 and multiple it by the 35%.

The equation would look like...

30 x .35 =

This will give you $10.50, which isn't the final answer.

You would then subtract 10.50 from the $30 that was asked for at the beginning by the retailer.

Your final answer is $19.50. :) Which isn't a bad deal if I say so myself.

3 0

3 years ago