a research lab is to begin experiments with a bacteria that doubles every 4 hours. the lab starts with 200 bacteria. a. how many bacteria will be present at the end of 12th hour? b. how many bacteria will be present at the end of one day? please answer this
Answer:
A) 1600 bacteria
B) 12800 bacteria
Step-by-step explanation:
We are told that the bacteria doubles every 4 hours.
Now, if the amount of bacteria is X, it means that for 4 hours, it becomes 2X and after 8 hours it becomes 2(2X)
For 12 hours, it becomes; 2 × (2(2X))
This means that for 12 hours, it becomes 2 × (2(2X)) = 8X
A) Since the lab starts with 200 bacteria, after 12 hours, it has;
N_12 = 8 × 200.
N_12 = 1600 bacteria
B) From above, we have seen that after t hours, where t is a multiple of 4, the number of bacteria is;
N_t = [2^(¼t - 1)] × (2X)
Where X is initial amount of bacteria.
Thus, after a day which is 24 hours, we have;
N_24 = 2^(¼(24) - 1) × 2X
N_24 = 2^(5) × 2X
Where X is 200, N_24 = 32 × 2(200) = 12800 bacteria
In the figure below find the missing angles
Point A located at -11 and -7 on the coordinate plan is reflected over the X axis to form point B.Then point B is reflected over the y axis to form point C. What are
the coordinates of points B and C
Answer:
The coordinates of B are (-11,7)
The coordinates of C are (11,7)
Step-by-step explanation:
Reflection of Points
Given a point (x,y), it can be reflected in several ways. Two of the most-used are reflection over the x-axis and reflection over the y-axis.
When the point is reflected over the x-axis, the x-coordinate is unchanged, and the y-coordinate is inverted: (x,y) -> (x,-y).
When the point is reflected over the y-axis, the y-coordinate is unchanged, and the x-coordinate is inverted: (x,y) -> (-x,y).
Point A is located at (-11,-7). It's reflected over the x-axis to form point B whose coordinates are (-11,7).
Then, point B is reflected over the y-axis to form point C with coordinates (11,7).
The coordinates of B are (-11,7)
The coordinates of C are (11,7)
Neil's bank offered him a 4.95% interest rate for his mortgage. If he
purchases 3 points, what will his new rate be?
O A. 0.375%
O B. 4.575%
C. 1.75%
O D. 4.375%
Neil's new interest rate after purchasing 3 points would be 7. 95%. The closest option is B. 4.575%.
How to calculate the interest rate?To calculate the new interest rate after purchasing points, we need to know the cost of one point and the number of points purchased.
One point typically costs 1% of the mortgage amount, so three points would cost 3% of the mortgage amount. The cost of the points is usually paid upfront at closing.
Assuming Neil's mortgage amount is $100,000, the cost of 3 points would be:
3% x $100,000 = $3,000
To calculate the new interest rate, we need to add the cost of the points to the original interest rate and then recalculate it as a percentage:
New rate = Original rate + (Cost of points / Mortgage amount)
New rate = 4.95% + ($3,000 / $100,000)
New rate = 4.95% + 3%
New rate = 7.95%
So, Neil's new interest rate after purchasing 3 points would be 7. 95%. The closest option is B. 4.575%.
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Need help ASAP!!!Thanks
Answer:1144.2 for question 5
Step-by-step explanation:
Which layer of a soil profile forms first from the bedrock?
A. A horizon. B.B horizon C.C horizon D. humus
y=6(x-7)(x+2) standard form
Answer:
y=6x^2-30x-84
Step-by-step explanation:
If the inverse of a conditional statement is true, which of the following must also be true?
Select one:
a. the original conditional statement
b. its converse
c. its contrapositive
Answer:Original Conditional: P → Q = If it is raining, then the driveway is wet. The inverse of a conditional negates both the hypothesis and the conclusion. Inverse: ∼ P → ∼ Q = If it is not raining, then the driveway is not wet.
Step-by-step explanation:
4 1/2 × 4 3/4
jjnuhyhyhyhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
Answer:
21.375
PS:
I could get my calculator to make the product as a fraction if you want.
Which points are separated by a distance of 5
Answer:
A
Explanation
6-1=5
3-3=0
0+5=5
Rahul has a farm he wishes to fence. The farm is the pentagon ABCDE, shown
below. He knows that ABCD is a 140 m by 150 m rectangles, as shown below.
He also knows that E is 50 m from the side AB and 30 m from the side BC.
Determine the length of AE, the length of DE, and the perimeter of the pentagon
ABCDE.
The diagram of the pentagon is missing, so i have attached it.
Answer:
|AE| = 130 m
|DE| = 150 m
Perimeter of pentagon = 720 m
Step-by-step explanation:
From the diagram, we can find AE from pythagoras theorem;
|AE| = √(|AA'|² + 50²)
Where AA' is the length from A to the perpendicular angle.
Now, AB = 150, and A'B is parallel to 30 m. Thus, A'B = 30
AA' = AB - A'B = 150 - 30
AA' = 120
Thus;
|AE| = √(120² + 50²)
|AE| = √(14400 + 2500)
|AE| = √16900
|AE| = 130
Similarly,
|DE| = √(|DD'|² + |ED'|²)
ED' = BC - 50
ED' = 140 - 50
ED' = 90
Also, DD' is parallel to AA' and is = 120
Thus;
|DE| = √(120² + 90²)
|DE| = √22500
|DE| = 150
Perimeter of pentagon = 150 + 130 + 150 + 150 + 140 = 720
Please answer the only one that's empty the question is
+ 10 = +
Answer:
2(10-x)+12
Step-by-step explanation:
find the vertex f(x)=2(x+14)^2-6
Answer:
(-14,-6)
Step-by-step explanation:
If the vertex form of a
quadratic equation is y = (x -
7)^2-4, what are the zeros and
the coordinate of the y-
intercept? *
Answer: x = {5, 9} ; (0,45)
Logan owed his brother $7.50. For his birthday, Logan received $20 from his grandpa. After paying his brother back, how much money will Logan have?
Answer:
$12.50
Step-by-step explanation:
20 - 7.50=12.50
Answer:$12.5
Step-by-step explanation:
calculator
Andre and Elena are solving this system of equations.
Y=3x
Y=9x-30
Andre’s first step is to create a new system:
3y=9x
Y=9x-30
Do you agree with either first step?
A-both strategies work
B-only the first strategy works
C-only the second strategy works
D-neither strategies work.
Answer:
A-both works
Step-by-step explanation:
one can simply sub into the second equation from the first step's one and remove an unknown, making it easy to solve
One side of a cube is 6 cm long. Its weight is 220 g. What is the density of the cube?
Answer:
36.67 ..sorry if I'm wrong
20 POINTS NO CAP PLEASE HELP ME NEED RIGHT ANSWER
Answer:
3x-10+25+x+15=180
4x+30=180
4x=180-30
4x=150
x=37.5
Answer:
37.5555
Step-by-step explanation:
A bakery sells 3642 pastries in 2010. The bakery sells 8422 pastries in 2015. Write a linear model that represents the number y of pastries that the bakery sells x years after 2010
Answer:
y = 936x + 3742
Step-by-step explanation:
If it is a linear model, then we should have a slope and y-intercept with the equation representing the model as;
y = mx + c
where m is the slope and c is the y-intercept
Thus, we have for the slope;
(8422-3742)/(2015-21010) = 4680/5 = 936
So the equation will be;
y = 936x + c
To get c , we can use the years after 2010 which is 2015 in this case
8422 = 936(5) + c
c = 8422- 4680
c = 3742
So the linear model is;
y = 936x + 3742
Felicia has grown five pumpkins. The first is 25.34 pounds. The second
weighs 10.23 pounds less than the first. Both the third and fourth pumpkin
are 13.2 pounds. If the combined weight of the pumpkins is 71.87 pounds,
how much does the fifth pumpkin weigh?
Answer:
5.02
Step-by-step explanation:
Sketch a 9 red counters and 4 yellow counters.How many zero pairs can you make?How many counters do you have after you remove the zero pairs? What do they represent
Answer:
36.75 and 1/6 ( 6 accounts equally distributed )
Step-by-step explanation:
Number of Red counters to be sketched = 9
Number of Yellow counters = 4
The number of Zero pairs that can be made = 36.75
When you remove the Zero pairs the number of counters you would have = 6 accounts ie. 1/6
While on vacation in Mexico, Karla's family exchanged 250 dollars for 5,000 pesos. Karla
bought a statue of a surfing monkey for 480 pesos. Complete the table below to show how
many dollars the statue cost.
pesos
dollars
5,000
250
25
1
3
480
Answer:
Filling the table;
left-hand side from top to bottom, empty spaces are;
500 pesos
20 pesos
60 pesos
On right hand side;
the only space is 24 dollars
Step-by-step explanation:
Here, we want to complete the given table
The key to complete the table is knowing the exchange rate
Since 250 dollars have 5,000 pesos
what this mean is that 1 dollars is 5000/250 = 20 pesos
And 1 pesos = 250/5000 = 0.05 dollars
25 dollars in pesos will be;
25 * 20 = 500 pesos
1 dollars in pesos is 20 pesos
3 dollars in pesos will be 3 * 20 = 60 pesos
480 pesos in dollars will be 480 * 0.05 = 24 dollars
Alex chose a pair of jeans that sells for $19.50, but today all jeans are on sale for 10% off. How much will Alex save. Explain your answer.
Answer:
He saves $1.95. Instead of paying $19.50, He pays $17.55
Step-by-step explanation:
$19.50 ×10/100 = $1.95
That is the discount of the jeans. Taking
$19.50 - $1.95 = $17.55
A store offers four different brands of a product. It decides to eliminate the brand that is most likely to be returned. The table shows the number of items of each brand that were returned over the past year and the total sold. which brand should the store eliminate? A. Brand A B. Brand B C. Brand C D. Brand D
The brand that the store should eliminate out of the 4 given brands using the data in the table is; Brand C
How to Solve Percentage Problems?To find the brand that the store should eliminate we need to find the percentage of sold items that were returned and pick the highest percentage as the brand the store should eliminate.
Brand A percentage = 33/636 * 100% = 5.19%
Brand B percentage = 15/492 = 3.05%
Brand C percentage = 29/362 * 100% = 8.01 %
Brand D percentage = 32/767 * 100% = 4.17%
Brand C has the highest percentage and as such it is the brand that should be eliminated.
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I need help on this one
Answer:13.7
Step-by-step explanation:
The question is asking us to build an algebraic model of this question, to do this, we need to use the slope intercept form.
Let's first identify the known data. We know that a pizza with two toppings is 9.95. In addition, we know that a topping itself is 1.25. We need to find the y intercept first in order to solve this equation, therefore we need to find how much a pizza his without the two toppings. So, we do 1.25(2)=2.5 and subtract it from 9.95. 9.95-2.5= 7.45. Now, this is our y intercept, because this will always stay the same and this is where we always start off. The slope itself however will be 1.25x, because x is the amount of toppings. So, as of now, we have constructed our equation
y=1.25x+7.45
We are looking to see how much a pizza is with 5 toppings, so we plug 5 into x
y=1.25(5)+7.45= 13.7
what is the answer to this 25+a=42
Answer:
a = 17
Step-by-step exlanation:
42 - 25 = 17
25 + 17 = 42
Answer:
a=17
Step-by-step explanation:
25 + a = 42
-25 -25
a=17
Hope this helps!
Which of the following is a true statement about polygons?
A) Each line segment intersects exactly two other line segments
B) Each line segment intersects at least two other line segments
C) Each line segment intersects exactly one other line segment
D) Each line segment intersects at least one other line segment
Will mark as brainliest if correct!!
Answer:
A
Each side must intersect exactly two others sides but only at their endpoints. The sides must be noncollinear and have a common endpoint.
Please answer correctly !!!!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!!!!!
Answer:
x=143
Step-by-step explanation:
Using the rule vertical angles then the rule of corresponding angles, you can see that they are congruent.
There is 3/4 of a box of cereal remaining. You eat 2/5 of the remaining cereal. What fraction of the box do you eat? Hint: What mathematical operation does the word “of” mean?
the answer must be a fraction
Answer:I think it’s 7/20
Step-by-step explanation:
What is the solution to 2(x-4)=16
Answer:
x=12
Step-by-step explanation: