Answer:
i dont know
what to say
Step-by- 2560 = 1000 x (2 + 5 + 6)
Plz help plz ill give brainliest
A scientist is growing bacteria.
The number of bacterial cells triples every week.
There are currently 20 cells.
Which expression shows how to find the number of cells in 4 weeks?
A. f (4) = 3 ∙ 204
B. f (4) = 4 ∙ 203
C. f (4) = 20 ∙ 34
D. f (4) = 20 ∙ 43
Answer:
B. f (4) = 4 · [tex]20^{3}[/tex]
Step-by-step explanation:
I did the quiz too
please please help me understand so i can do the rest myself thank you
Step-by-step explanation:
The given figure can be broken into three parts i.e. a triangle, and two rectangles as shown in the figure.
The base and height of triangle is 15 and 7 in. respectively
For II shape, length and width are 8 and 2 in. respectively
For III shape, length and width are 10 and 9 in. respectively.
Can someone please help me out with my grades are bad
Answer:
Step-by-step explanation:
In a dilatation for find the new coordinates we have to multiply the initial value for the the scale factor
A’(-3, 12)
B’(9,6)
C’(-9,-3)
so the general rule is:
(x,y) -> (3x, 3y)
Which of the following statements are true? Select all that apply.
22 and 23 form a linear pair
21 and 24 are supplementary angles.
21+ 2+ 3 = 180
23 + 24 = 21+ 22
21 and 24 are vertical angles.
Answer:
The only true statement is:
"∠3 + ∠4 = ∠1 + ∠2"
Step-by-step explanation:
When we have two lines intersect each other, there are 4 angles generated in the intersection.
Two vertical angles are angles whose only "contact point" is the intersection itself. The vertical angles are supplementary only if the two lines are perpendicular.
While a linear pair are two angles that are separated by one of the lines, and linear pairs are always supplementary.
Now let's look at the image and see which statements are true and which ones aren't.
"∠2 and ∠3 form a linear pair"
If we look at the image, we can see that ∠2 and ∠3 are not separated by one of the lines, ∠2 and ∠3 are vertical angles, then this statement is false.
"∠1 and ∠4 are supplementary angles"
Two angles are supplementary if the sum of the measures is equal to 180°, such that, as stated before, a linear pair of angles are supplementary angles.
In the case of ∠1 and ∠4, we can see that these angles are vertical angles, and we also can see that the lines are not perpendicular, then angles ∠1 and ∠4 are not supplementary.
"∠2 and ∠3 = 180°"
This is the same as saying that "∠2 and ∠3 are supplementary"
By the exact same reasoning than in the previous statement, we can find that this one is false.
"∠3 + ∠4 = ∠1 + ∠2"
We know that ∠1 and ∠2 are a linear pair, then ∠1 and ∠2 are supplementary angles, then:
∠1 + ∠2 = 180°
And we know that ∠3 and ∠4 also are a linear pair, and then also are supplementary angles, then we also have:
∠3 + ∠4 = 180°
Then is true that:
∠3 + ∠4 = ∠1 + ∠2
This statement is true.
"∠2 and ∠4 are vertical angles"
We can see that ∠2 and ∠4 are separated by one of the lines, then these angles form a linear pair.
The statement is false.
How many radius make a complete circle
Answer:
Step-by-step explanation:
It takes 2 π 2\pi 2π radians (a little more than 6 radians) to make a complete turn about the center of a circle. This makes sense, because the full circumference of a circle is 2 π r 2\pi r 2πr , or 2 π 2\pi 2π radius lengths.
Please help I have another question with the same criteria
X|1 2 3 4 5 6
Y|9 13 25 27 31 46
Write the decimal represented by each point.
Answer:
A) ,8
B) .3
C) .5
D) .2
(y* - 5)(yx + 5)
please help
Answer:
Simplified the expression.
y2x+5y−5yx−25
I think this is what were were asking, if not please explain better.
Hope this helps :D
plz like & brainly
If a car car travels 190 km at 10 hours find how much speed will be travelled in one hour?
Answer:
19km
Step-by-step explanation:
190km divided by 10hr = 19km per 1hr
Calculate the value of angle B
Answer: 66.4
Step-by-step explanation:
The trig ratio you would use is inverse cosine or [tex]cos^{-1}[/tex].
Cos is adjacent/hypotenuse
So, the ratio you would use is [tex]cos^{-1}[/tex] [tex]\frac{2}{5}[/tex].
Insert this in a calculator which come out to be 66.421821522.
But you have to round, so you answer is 66.4.
Help w this question please its #11 btw
Answer:
cgtcdtxcgv gg ok
Step-by-step explanation:
please help me!! asap!!
Answer:
answer: 85
Step-by-step explanation:
These add up to 360 and
85 + 85 + 95 + 95 = 360 so 85 is the answer.
Hope that helps!
What is the value of x, rounded to the nearest tenth?
4.6 cm
48°
O x=6.9
O X9.1
O x=2.6
O x=6.2
Answer:
X = 6.2
Step-by-step explanation:
[tex] \sin(48) = \frac{4.6}{x} \\ 0.7 = \frac{4.6}{ x } \\ x = 4.6 \div 0.7 = 6.2[/tex]
The current of the ocean is carrying a boat at an angle 350 degrees at 4 mph. If a tugboat is pulling the boat at 11 mph, what angle (to the nearest tenth of a degree) must it pull at to insure that the boat is pulled at exactly an angle of 0 degrees? (Hint: Component vectors will help here)
Answer:
Step-by-step explanation:
3.6 trust me
What is the approximate number of wins for the four teams?
A) 200
B) 230
C) 240
D 250
answer
the answer is is is option a 200
A circle has a diameter of 16 yd. What is the radius of the same circle?
Answer:
8yd
Step-by-step explanation:
the diameter is the whole distance going from one end to another through the center of the circle, so if the whole distance is 16 then you can divide 16 by 2 because the radius is only half of the distance.
8 + 8 = 16yd.
C
Which points are reflections of each other across the y-axis?
8
6
1 2
24
-9 -6 -4 -2
-2
2
ܘܠܐ
6 8 x
-4
-6
-8
(-7 -3) and (7-3)
(-5 4) and (5.-4)
(1, -8) and (18)
Answer:
[tex](a)\ (-7,-3)\ \&\ (7,-3)[/tex]
Step-by-step explanation:
Given
Options a, b and c
Required
Points that are reflections across y-axis
The rule of reflection across the y-axis is:
[tex](x,y) \to (-x,y)[/tex]
Testing the given options:
[tex](a)\ (-7,-3)\ \&\ (7,-3)[/tex]
Rule: [tex](x,y) \to (-x,y)[/tex]
[tex](-7,-3) \to (-(-7),-3)[/tex]
[tex](-7,-3) \to (7,-3)[/tex]
This is true, because the actual reflection equals the given reflection
[tex](b)\ (-5,4)\ \&\ (5,-4)[/tex]
Rule: [tex](x,y) \to (-x,y)[/tex]
[tex](-5,4) \to (-(-5),4)[/tex]
[tex](-5,4) \to (5,4)[/tex]
This is not true, because the actual reflection does not equal to the given reflection
[tex](c)\ (1,-8)\ \&\ (1,8)[/tex]
Rule: [tex](x,y) \to (-x,y)[/tex]
[tex](1,-8) \to (-1,-8)[/tex]
This is not true, because the actual reflection does not equal to the given reflection
Hence
[tex](a)\ (-7,-3)\ \&\ (7,-3)[/tex] is a reflection of each other across y axis
A school survey says that 75% or 294 of the 8th graders have cell phones how many 8th graders are there?
Answer:
75
____ x 294 = 220.5 around 221 students.
100
The keyword of means multiplication.
Consider a percent out of 100.
A way to remember is that: "cent" means 100.
A 400 gallon tank initially contains 300 gallons of water containing 0.8 lb of salt. Suppose water containing 0.6 lb of salt per gallon flows into the top of the tank at a rate of 2 gallons per minute. The water in the tank is kept well-mixed, and 7 gallons per minute are removed from the bottom of the tank. a. Write an initial value problem for S(t), the amount of salt in the tank at time t. Do not solve the equation!! b. Write an expression in terms of S for the amount of salt in the tank when the tank is one-quarter full. Show all your work on the paper you scan and submit. You do not need to type anything in the box below.
Answer:
a. dS(t)/dt + [7S(t)/(300 - 5t)] = 1.2 with S(0) = 0.8
b. S(t) = [tex]\frac{120e^{\frac{7t}{100} } }{7}[/tex] - 16.34[tex]e^{-\frac{7t}{100}[/tex]
Step-by-step explanation:
a. Write an initial value problem for S(t), the amount of salt in the tank at time t. Do not solve the equation!!
The net mass flow rate of salt dS(t)/dt = mass flow in - mass flow out
mass flow in = concentration of flow in × flow rate in = 0.6 lb/gal × 2 gal/min = 1.2 lb/min
Let S(t) be the mass of salt in the tank at time, t. The concentration of salt in the tank at time, t, C(t) = S(t)/volume of tank at time t ,V
V = V₀ + (r - r')t where V₀ = initial volume of water in tank = 300 gal, r = volume flow rate in = 2 gal/min, r'= volume flow rate out = 7 gal/min and t = time
So, V = V₀ + (r - r')t
V = 300 + (2 - 7)t
V = 300 - 5t
So, C(t) = S(t)/V = S(t)/(300 - 5t) lb/gal
Now, mass flow rate out = concentration in tank × volume flow rate out = S(t)/(300 - 5t) lb/gal × 7 gal/min = 7S(t)/(300 - 5t) lb/min
So, dS(t)/dt = mass flow in - mass flow out
dS(t)/dt = 1.2 lb/min - 7S(t)/(300 - 5t) lb
dS(t)/dt = 1.2 - 7S(t)/(300 - 5t)
So, our differential equation is
dS(t)/dt + [7S(t)/(300 - 5t)] = 1.2 with S(0) = 0.8 since we initially have 0.8 lb of salt
b. Write an expression in terms of S for the amount of salt in the tank when the tank is one-quarter full.
When the tank is one-quarter full, V = volume of tank/4 = 400 gallons/4 = 100 gallons
We now solve our differential equation
dS(t)/dt + 7S(t)/100 = 1.2
Using the integrating factor method, I.F = [tex]e^{\int\limits{\frac{7}{100} \, dt } =[/tex] [tex]e^{\frac{7t}{100} }[/tex]
[tex]e^{\frac{7t}{100}[/tex]dS(t)/dt +
d[[tex]e^{\frac{7t}{100}[/tex]S(t)]/dt = 1.2
d[[tex]e^{\frac{7t}{100}[/tex]S(t)] = [1.2
integrating both sides, we have
∫d[[tex]e^{\frac{7t}{100}[/tex]S(t)] = ∫[1.2
Let u = 7t/100. So, du/dt = 7/100 and dt = 100du/7
∫[1.2[tex]e^{\frac{7t}{100}[/tex]]dt = ∫[1.2 × 100[tex]e^{u}[/tex]]du/7 = (120/7)∫
[tex]e^{\frac{7t}{100}[/tex]S(t) = [tex]\frac{120e^{\frac{7t}{100} } }{7}[/tex] + C
S(t) = [tex]\frac{120e^{\frac{7t}{100} } }{7}[/tex] ÷ [tex]e^{\frac{7t}{100}[/tex] + [tex]e^{-\frac{7t}{100}[/tex]
S(t) = [tex]\frac{120e^{\frac{7t}{100} } }{7}[/tex] + C[tex]e^{-\frac{7t}{100}[/tex]
From our initial condition, S(0) = 0.8. So,
S(0) = [tex]\frac{120e^{\frac{7(0)}{100} } }{7}[/tex] + C[tex]e^{-\frac{7(0)}{100}[/tex]
S(0) = [tex]\frac{120e^{\frac{0}{100} } }{7}[/tex] + C[tex]e^{-\frac{0}{100}[/tex]
S(0) = [tex]\frac{120e^{0}}{7}[/tex] + C[tex]e^{0}[/tex]
0.8 = [tex]\frac{120}{7}[/tex] + C
C = 0.8 - 120/7
C = 0.8 - 17.14
C = - 16.34
So,
S(t) = [tex]\frac{120e^{\frac{7t}{100} } }{7}[/tex] - 16.34[tex]e^{-\frac{7t}{100}[/tex]
2c - 3b when
C = 8 and b = 3.5
Answer:
5.5
Step-by-step explanation:
2x8 = 16
3x3.5=10.5
16-10.5 = 5.5
HELP ME PLEASE!!!!!!!
Answer:
here are the cordinates you need to mark :
Step-by-step explanation:
(1,15) : 1x,15y
(2,20) : 2x,20y
(3,35) : 3x,35y
(4,45) : 4x,45y
(5,70) : 5x,70y
Hope this helps :)
If y=
-x and x = -12, find y.
Answer:
y = - 3
Step-by-step explanation:
[tex]y = \frac{1}{4}x[/tex]
y = 0.25 · x
y = 0.25 · - 12
y = - 3
High school students from track teams in the state participated in a training program to improve running times. Before the training, the mean running time for the students to run a mile was 402 seconds with standard deviation 40 seconds. After completing the program, the mean running time for the students to run a mile was 368 seconds with standard deviation 30 seconds. Let X represent the running time of a randomly selected student before training, and let Y represent the running time of the same student after training. Which of the following is true about the distribution of X-Y?
a. The variables X and Y are independent, therefore, the meanis 34 seconds and the standard deviation is 10 seconds.
b. The v ales X and Y are independent therefore, the meanis 34 seconds and the standard deviation is 50 seconds
c. The variables X and Y are not independent, therefore, the standard deviation is 50 seconds and the mean cannot be determined with the information given.
d. The variables and are not independent, therefore, the meanis 3 seconds and the standard deviation cannot be determined with the information given
e. The variables X and Y We not independent, therefore, neither the mean nor the standard deviation can be determined with the informantion given.
Answer:
D
Step-by-step explanation:
Using subtraction of normal variables, it is found that the correct option is:
b. The values X and Y are independent therefore, the mean is 34 seconds and the standard deviation is 50 seconds.
When two normal variables are subtracted, the mean is the difference of the means, while the standard deviation is the square root of the sum of the variances.
In this problem:
Variable X has mean 402 seconds, standard deviation of 40 seconds.Variable Y has mean 368 seconds, standard deviation of 30 seconds.They are independent, hence:
[tex]\mu = 402 - 368 = 34[/tex]
[tex]\sigma = \sqrt{40^2 + 30^2} = 50[/tex]
Option b is correct.
A similar problem is given at https://brainly.com/question/24250158
Helpp plzz will mark brainleast
The members of a schools math club is voting for president. Ana (A), Brendan (B), Clara (C), and Damaris (D) are running for the position. Their votes are summarized in the following
preference table:
18
10
4
Number of Votes
First Choice
А
B
D
С
Second Choice
B
D
B
B
С
A
С
Third Choice
Fourth Choice
D
С
А
a) Using the Plurality Method, which student would be selected?
A-
votes, Bol
votes C-
vobes
D-
votes. The winner is
The winner
b) Using the Borda Count Method, which person would be selected?
A
I points, B-l
points, co
points
DEL
points. The winner is
c) Using the Plurality-with-Elimination Method, which person would be selected?
Need
points for a majority Overall winner is
with
Notes
D Step-by-step explanation:
What’s the answer (no link I give brainly)
Answer:
I belive it is C
Step-by-step explanation:
NEED HELP ASAP A family traveling home after a reunion Records the time in hours and the distance they are from home in miles based on the scatter plot the family is miles from home after the first 3.5 hours
Answer:
300 miles
Step-by-step explanation:
The required answer can be obtiaed by tracing the point where travel time = 3.5 hours directly upward to meet the dotted point. This point is then traced to the y axis which gives the number of miles from home the family has traveled based on the hours they used.
By doing this on the scatter plot Given, the number of miles from home after 3.5 hours is 300 miles.
Ellianna made a scatter plot that showed a positive association and had one outlier. Write a possible scenario for Ellianna's scatter plot
Hint
o
The scatter plot could show test scores based on number of student absences. The outlier could be a student with high test scores who has many
absences,
The scatter plot could show the amount of pay workers at a factory received based on the number of years they have worked at the factory. The
outlier could be someone who is very skilled and has learned her job quickly.
The scatter plot could show the amount of weight that someone gains based on the number of calories that they consume. The outlier could be
someone who eats few calories and does not gain much weight.
The scatter plot could show the amount of weight that a elephant gains based on its age. The outlier could be an adult elephant that weighs more
than a baby elephant.
Answer:
not sure ask teacher for help
Step-by-step explanation:
ok
#2 Your 18% tip on a meal at a restaurant was $5.40. How much was the bill?
Explain your work using the percent method of your choice.
PLEASE ANSWER I NEED HELP WHO EVER ANSWERS I WILL MARK BRAINLIEST
PLEASE HELP I WILL MAKE YOU BRAINLIEST IF IT LETS ME
NO FAKE LINKS OR YOU WILL BE REPORTED
Answer:
I am almost postive it is B, D, E