# Posts by melinda

Total # Posts: 177

Physics
a uniform thin wire is bent into a semicircle of radius r, determine the coordinates of its center of mass with respect to an origin of coordinates at the center of the full circle

physics
A uniform thin wire is bent into a semicircle of radius r. Determine the coordinates of its center of mass with respect to an origin of coordinates at the center of the "full" circle. Because wire is uniform x (sub cm) = 0 mass=dm length=dl coordinates (x,y) = (r cox...

physics
A uniform thin wire is bent into a semicircle of radius r. Determine the coordinates of its center of mass with respect to an origin of coordinates at the center of the "full" circle. Because wire is uniform x (sub cm) = 0 mass=dm length=dl coordinates (x,y) = (r cox...

math
In a Garden one fourth of the plants are peppers of the pepper plants one-third are yellow peppers what fraction of the plants are yellow peppers

Basic Geometry
What does ' mean? ie. triangle abc is congruent to triangle a'b'c'

Math
in a rectangle the measures of the base and the altitude are in a ratio of 1:4. I f the rectangle is equal in area to a square with a perimeter of 60 feet, find the dimensions of the rectangle HELP PLEASE TYSM!!

Algebra

Algebra
If 6 is a root of the equation x^2-8x+k=0, find the value of k.

Algebra

teaching in early chldhood programs
Which of the following is an example of an appropriate activity-plan objective? A. The child puts the story characters in sequence on the flannel board. B. The child feels good about his or her participation in the activity. C. Children think about seeds and leaves. D. The ...

◦teaching in early chldhood programs
Which of the following is an example of an appropriate activity-plan objective? A. The child puts the story characters in sequence on the flannel board. B. The child feels good about his or her participation in the activity. C. Children think about seeds and leaves. D. The ...

teaching in early chldhood programs
I need help

teaching in early chldhood programs
Which of the following is a common mistake new teachers make when setting up learning centers? A. Planning specific activities for blocks or dramatic play B. Introducing the centers to children so they know how to use them C. Allowing the children to interrupt the silence of ...

•teaching in early chldhood programs
Thanks Ms.Sue

•teaching in early chldhood programs
Which of the following is a correct statement about exploratory play? A. In exploratory play, children assume primary responsibility. B. In exploratory play, who assumes responsibility depends on which learning center the activity is set up in. C. In exploratory play, children...

•teaching in early chldhood programs
When assessing the overall layout of a classroom, what two factors should be so clear that children's movement behavior will be directly influenced? A. The amount of child-accessible storage and the presence of children's art materials B. The location of large group ...

teaching in early chldhood programs
A teacher is concerned about monitoring the progress of individual children in the second-grade classroom. What would be the best advice to give the teacher? A. Give a test periodically to see if the children have achieved according to the standards set. B. Use centers only ...

The figure shows three rotating, uniform disks that are coupled by belts. One belt runs around the rims of disks A and C. Another belt runs around a central hub on disk A and the rim of disk B. The belts move smoothly without slippage on the rims and hub. Disk A has radius R; ...

Physics
The figure shows three rotating, uniform disks that are coupled by belts. One belt runs around the rims of disks A and C. Another belt runs around a central hub on disk A and the rim of disk B. The belts move smoothly without slippage on the rims and hub. Disk A has radius R; ...

What is a biology lab practical?
Is it a test on paper or can I look at notes and answer questions? Do I have to dissect something, have the TA ask me a question and answer instead of dissecting as a group? I've just been quizzing myself on parts of the animal in case we can't use notes, but I don'...

chemistry
Na3PO4(aq) and AgNO3(aq). Write the ionic equation.

science
a 60.0kg boy runs up the stairs of a football stadium to a height of 12m above the ground 15s.what are the work and power student has done

algebra 1 part 2
What are the minimum, first quartile, median, third quartile, and maximum of the data set? As cars passed a checkpoint, the following speeds were clocked and recorded. Speed (mph): 55 62 61 54 68 72 59 61 70

EMS

EMS

Finance
Stephenson Real Estate Capitalization

algebra
y = 5x, solve for x

Economics
How do I write a paper on "Why we trade with Brazil?"

staticstics
The average length of an adult blue whate is 30 meters with a standard deviation of 5.7 meters. If a sample of 31 whales is taken, what is the probability that their average lenght differs from the mean by more than 2.0 meters

staticstics
The average length of an adult blue whate is 30 meters with a standard deviation of 5.7 meters. If a sample of 31 whales is taken, what is the probability that their average lenght differs from the mean by more than 2.0 meters

algebra
5A=5-b 5A=3-b

Chemistry
This is a three part problem I need help in figuring out pleaseI n each of the questions below you are going to determine a different type of balanced equation for the same reaction. Make sure your equations have the lowest whole number coefficients possible. Indicate the ...

Chemistry
This is a three part problem I need help in figuring out pleaseI n each of the questions below you are going to determine a different type of balanced equation for the same reaction. Make sure your equations have the lowest whole number coefficients possible. Indicate the ...

Chemistry
Write the molecular equation for the combination of aqueous solutions of sodium chloride and silver nitrate. Enter your answer as the sum of all coefficients.

Chem
A sample of an unknown biochemical compound is found to have a percent composition of 55.03 percent carbon, 5.54 percent hydrogen, 32.10 percent nitrogen and the balance oxygen. What is the simplest formula for this compound ? How do I do this?

Algebra
-214 / 2

Algebra
(-36)/(-2) =

math
subtract 345 from 678

math
solve the problem 456 + 65.

math
At Thanksgiving dinner, Deborah ate a portion of turkey (673 calories;masch potatoes (408 calories);stuffing (519 calories); cranberry sauce (219 calories);beans (278 calories); and pumpkin pie (523 calories); approximately how many calories did she intake?

math
randall opened a savings account on June 1st and made the following deposits: \$212.19, June 5th \$23.03, June 12 \$307.15, June 19th \$652.00 and June 30, \$78.75. Assuming he made no withdrawals, approximately how much did he have in the savings account at the end of the month of...

math
round off 16,352 to the nearest tens

earth
how long will it take Uranium-238 for there to ne 25% of the original radioactive period to be left? i need this question answered ASAP!!!!!(:

algebra 2
T=3

Biology
how many properties of blood exists

Calculus and vectors

Calculus and vectors
Do the vectors (2,0,1),(-2,0,0) and (2,3,0) lie on the same plane? Explain your reasoning.

Calculus
Vector C=5 and Vector D=8. The angle formed by C and D is 35 degrees, and the angle formed by A and C is 40 degrees. Determine |B|. Here is the image for triangle: imgur dot com/OZAwV please help, I have a test tomorrow~

Calculus
If a(0,-1,3)+b(1,1,1)-c(1,2,5)=(-2,3,-8), determine a,b,c Is this the correct answer: a= -4, b= -3, c= -1?

Calculus and vectors
A parallelogram is formed by R^3 by the vectors PA=(3,2,-3) and PB=(4,1,5). The point P=(0,2,3). a) what are the location of the vertices? b) what are the vectors representing the diagonals? c) what are the length of the diagonals?

Calculus
If a(0,-1,3)+b(1,1,1)-c(1,2,5)=(-2,3,-8), determine a,b,c

Calculus & Vectors
Could someone explain this question to me? I attempted the question and here is why I chose the answer below. Thank you! -------------------------------------- 1. If A ⃗ is a vector representing 50 km/h northeast, what is 3/5 A ⃗? a) 30 km/h southwest b) 30 km/h ...

Calculus
An object is dropped from the observation deck of the Skylon Tower in Niagara Falls, Ontario. The distance, in metres, from the deck at t seconds is given by d(t)=4.9t^2 a) the height of the observation deck is 146.9 m. How fast is the object moving when it hits the ground? ...

Calculus
Which of the following is the maximum value of the function f(x)=2sinxcosx? a) 0 b) 1 c) 2 d) No maximum value

Calculus-derivatives
Determine the derivative for y=tanxcosx a) y'=-sinxtanx + cosxsec^2x b) y'=-sinxtanx + cosxtanx c) y'=cosxsec^2x d) y'=sinx - cosxsec^2x

Calculus-help~
A certain fast food restaurant wants to determine the increase in revenue per cheeseburger if sales are \$45,000. Let the function [p=(120000-x)/(30000)] represent the price of x cheeseburgers.

Calculus
I used this R(c)=(5000)(4600-400c) R'(c)=-200,000 in the question it says: The owner realizes that 100 fewer people would ride the bus for each \$0.25 increase in fare, and 100 more people would ride for each \$0.25 decrease in fare. So wouldn't it be (100-0.25) and (100...

Calculus
Determine the slope of the tangent to the function f(x)=5xe^x at the point with x-coordinate x=2 a) -1/5 b) 10e^2 c) 15e^2 d) -5e^2

Calculus-concave up and down
I still don't understand :| In the book, they show me a chart with given intervals (For ex. x<-2| -2<x<6| x>6|) Then sub numbers to find if it its concave or up. But this question doesn't have an equation but graph instead.

Calculus-concave up and down
Can someone explain this question to me? What intervals should I use to test whether or not the graph is concave up or down. Here is the URL for the graph. imgur dotcom/FdQCV

Calculus-derivatives
f(x) = (x-1)^(2/3)*(x+3) What are the critical numbers? the derivative would be =2/3(x-1)^(-1/3)(x+3) + (x-1)^2/3 What do I do next?

Calculus
Simplify difference quotients. 1/(1+h)-1/h I got 1-1-h/h but the answer is -1/(1+h)

Precalculus-Verify
log(base2)x-log(base2)6= log(base2)5+ 2log(base2)3 log(x/6)=3log15 (x/6)=15^3 6*(x/6)=15^3*6 x=15^3*6 =20,250 Answer is 270.... What did I do wrong...

Precalculus
What are the restrictions on the variable in the equation log(3x-5)-log(x-2)=log(x^2-5)? 5/3, 2, ???

Precalculus
Nevermind I got it!

Precalculus
May i know how you got x^2....

Precalculus
What am I doing wrong? I keep getting 48 and its wrong... Solve 2log(x)-log(4)=3log(4) 2log(x)-log(4) log(x/4)=3log4 log(x/4)=log12 x=48

Precalculus
Given the parent function f(x)log(base10)x, state the equation of the function that results from a vertical stretch by a factor of 2/5, a horizontal stretch by a factor of 3/4, a reflection in the y-axis , a horizontal translation 2 units to the right, and a vertical ...

Precalculus
Given the parent function f(x)log(base10)x, state the equation of the function that results from a vertical stretch by a factor of 2/5, a horizontal stretch by a factor of 3/4, a reflection in the y-axis , a horizontal translation 2 units to the right, and a vertical ...

Precalculus
Verify these answers please. 1. Which of the following functions would f(x) = log(base 10)x horizontally 4 units to the left? a) f(x)=log(base10)(x-4) b) f(x)=4Log(base10)X c) f(x)=log(base10) x+4 Answer: C ------------------------------------ 2. State the transformations, in ...

Precalculus
Ok, thank you!

Precalculus
Determine the exact value of cos 465 degrees a) √3 + √2/2 b) √2 + √3√2/4 c)√2 - √3√2/4 d)2+√2-√3√2/4

Precalculus
Thank you~

Precalculus
1. What two common identities are most useful for simplifying 2tanx/(sin^2x + cos^2x - tan^2x)? Two identities are: sin^2x + cos^2x = 1 and tan2x=2tanx/1-tan^2x

Precalculus
What two common identities are most useful for simplifying 2tanx/sin^2x + cos^2x - tan^2x? Two identities are: sin^2x + cos^2x = 1 and tan2x=2tanx/1-tan^2x

Precalculus
Explain how to do these please. 1. solve x=log(base2)*1/8 by rewriting in exponential form. 2. Solve log(3x+1)=5 3. Solve log(base x)8=-1/2

Trig
If a plane takes off on runway 31 (N 31o W) and flies 4 miles, then makes a right (90o) turn and flies 11 miles, what bearing will the traffic controller use to locate the plane?

Math
The number of library books in a school increased by 20% after it bought new books in may. The number increased by another 20% after a bookstore donated 300 books in June. Find the number of books in the library before it bought new books in May.

geometry
Express the following as a function of a single angle sin 20 degree cos 30 degree + cos 20 degree sin 30 degree

Math
Would someone verify these answers. 1. A person waves his hand back and forth, where their finger tips move past the starting position 4 cm in each direction. If he waves 20 times every 15s, what sine equation models the movement of the hand if the hand starts in the upright ...

Math
Thanks Drwls! For 1, I got the same answer however, the book says 263.89 m

Math
Would someone like to help me with these questions? Steps appreciated~ 1. If the diameter of a monster truck tire is 3.5 m and it makes one rotation every 5 seconds, how far does the tire roll in 1 minute? -------------------------------------- 2. At t=0 a car is due 2 km ...

Precalculus
Verify these answers 1.Which of the six trigonometric functions are positive in quadrant III? Answer: tangent and cotangent -------------------------------------- 2. What is the amplitude of the function y = pi/2 sin(6/3t - pi/6) + 14? Amplitude: pi/2...

Math
How does tanθ look like in a graph? What would it be their y values?

Math
How to setup this equation? Find the ratio of the surface area of a cylinder to the volume of the cylinder if the height remains at 10 cm. Simplify this ratio and let f(x) = the simplified ratio. Let r be the radius of the cylinder. a) Find the average rate of change as the ...

Precalculus
How do you setup the equation for this? Thanky ou! Find the ratio of the surface area of a cylinder to the volume of the cylinder if the height remains at 10 cm. Simplify this ratio and let f(x) = the simplified ratio. Let r be the radius of the cylinder. a) Find the average ...

Precalculus
Can someone help me with this question (It's a graph) imgur dot com/r16ba One of the answers would be: x= 2 not x=-2 (If you think its an unsafe website, type in google "Imgur," it'll show you that its a site to post images)

math
bring over -11 to the other side 11-13=3c

math
It's -0.83 7+5m=2-m 5m+m=2-7 6m=-5 Divide both by 6 which equals to -5/6 and if u divide -5/6, it'll be -0.83

Precalculus
Oh, its a website where we can post images, jiksha wouldn't allow me to post exact url

Precalculus
Can someone help me with this question (It's a graph) imgur dot com/r16ba One of the answers would be: x= 2 not x=-2

geometry
find the value of following sin(cos^-1 12/13) give your answer as a fraction

geometry
find the value of following sin(cos^-1 12/13) give your answer as a fraction

Math
I have no clue what to do on these questions. 1.Two resistors a and b are connected in parallel. The total resistance R in such a circuit is found by formula R= 1/a + 1/b. If R=5/6 ohms and b is one more ohm than a, find the number of ohms in a and b. 2. The profit function ...

math
An open-topped box is made from a rectangular piece of cardboard, with dimensions of 24 cm by 30 cm, by cutting congruent squares from each corner and folding up the sides. Determine the dimensions of the squares to be cut to create a box with a volume of 1040cm^3. What ...

Precalculus-helpp
Verify if my answers are correct. 1. The function y=x^3 has undergone the following sets of transformations. If y=x^3 passes through the points (1,1), (3,27) and (4,64), list the coordinates of these transformed points on each new curve. a) reflected in the y-axis, ...

Precalculus
Verify if my answers are correct. 1. The function y=x^3 has undergone the following sets of transformations. If y=x^3 passes through the points (1,1), (3,27) and (4,64), list the coordinates of these transformed points on each new curve. a) reflected in the y-axis, ...

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