# Posts by Robert

Total # Posts: 1,011

chemistry
A 30.0 g sample of water at 10.0°C is mixed with 50.0 g of water at 57.0°C in a calorimeter. Calculate the final temperature of the mixture

Calculus
I'm not sure what I am doing with my life.

navarro college biology
During the sequencing of dna into a protein, what is the first step?

English
Please could you help me that I don't have run on sentences or if I need commas.After reading "Man's Nature is Good" Mencius argues that man is born good but, that life itself makes a man evil. He states "Human nature is inherently good, just like water ...

Algebra
Solve. -9(4-k)/12 = 9(k+1)/8

Math
The vertical backboard located 4ft from the baseline supports the rim of the basketball net. The backboard measures 6ft wide by 4ft high. The shooter's square is a white box above the rim of the basket. It must measure 1 1/2 ft high and 2ft wide. What is the area of the ...

life orientation project
research and briefy discuss the following processes that the community must engage whenever there is an issue before and during a protest :how to engage in a protest, protest restrictions,permit to hold a protest, activities during a protest,as well as the powers of the police...

math
If A + B + c = 180 then show that sinA + sinB + sinC=4cosA/2. cosB/2 . cosC/2

General Chemistry 132
What is your profession Dr Bob

General Chemistry 132
When solid NH4NO3 is dissolved in water at 25celcius, the temp of the solution decreases. What is true about the signs of enthalpy and entropy for this process? I understand entropy is positive, however, i do no understand why enthalpy is also positive. Can someone please ...

precalculus
hyperbola with vertices at (0,+/-2), and asymptotes y=+- 1/2x

Science
How does the sun's gravitational attraction to the earth compare to that of the moon?

math:Fundamental Counting Principlal
solve the problem by applying the fundamental counting principal with two groups of items. Shaun is joining a music club. as part of ther 4-cd introductory package she can choose from 12 rock, 10 alternative, 7 country, and 5 classical. if Shaun choose one selection from each ...

math
A baker can make a cupcake for \$2.30. She would like a profit of 50 cents each. What is the percent markup on the cupcake, to the nearest tenth of a percent?

math
So do i just subtract 180-50.7?

math
2 line segments intersect to form an angle that has a measure pf 50.7 degrees. What is the measure in degrees of an angle that is supplementary to this angle. I don't understand what this question is asking me. Can someone explain it to me?

Chemistry
Use half reaction to balance: CuS + NO3^- = Cu(NO3)2 + NO2 + SO2 S^2- = SO2 S Oxidized Cu^2+ + NO3^- = NO2 + Cu(NO3)2 N Red After balancing the atoms & balancing the charges, I cannot get all the correct coefficients

Physics
You're an investigator for the National Transportation Safety Board, examining a subway accident in which a train going at 80km/h collided with a slower train traveling in the same direction at 20km/h . Your job is to determine the relative speed of the collision, to help ...

math
(x+3.57)+x+(x+2.97)=15 3.57+2.97+3x=15 6.54+3x=15 3x=15-6.54 3x=8.46 x=8.46/3 x=2.82 2.82+3.57+2.82+2.97+2.82=15 6.39+2.82+5.79=15

1
Because Hitler and his gang of goons took power.

Geraldo bought some computer software on layaway. He paid \$12 down and must make a payment of \$5 each week for 4 weeks. How much will Geraldo pay in all?

Algebra 2
Multiplying or dividing rational expressions 6x^2 + 13x - 5 divide by 6x^2 -23x + 7 Need to show my work.

multivariable calculus
show that a=!0 , the equation p=2asin0cos0 describes the sphere centered(a,0,0) at radius|a|

Physics
The mans mass would be the same as on earth so its just 560/9.8=57.14kg Second part is F=[(Gconstant)(m one)(m two)]/(radius)^2 G constant is 6.67E-11

Physics
static =velocity squared over (radius times gravity). solve for velocity and you get velocity to equal square root (radius*gravity*static)=square root of .15*.30*9.8= .664 m/s

math
its 58,000

math
i have tryed this like ten times but cant get the answer can u help. 58,00 times 7.40% after u get the answer between the two multiply by 3

^Fake person, anyways though Nun of your Buisness was right, but a minute after posting, yeah that was him.

Language Arts

Math
38 multiplied 4 equals 152 does not represent an inequality representing t - read the question again

geometry
a pentagon with a perimeter of 45 feet

English
To __________ shall I address this letter? A. whom B. who

I guess this is physics related?
Yeah I've done a project like this and we had to measure the time with a very precise instrument.

I guess this is physics related?
What is the biggest source of error in measuring the acceleration of a ball down a ramp? knowing the length of the ramp accurately measuring the time knowing the height of the ramp knowing the mass of the ball****

science
A + F = yes perhaps also "B - The orientation of the chamber" since this could change between one end of the chamber and the other? ? thoughts? orientation = up/down?

science
Yes, I think A + F could be confounding variables probably not B + D + E B does not change across the chamber D is irrelevant E is also irrelevant probably not C, this does not change across the chamber thoughts?

science
What is a confounding variable? "A confounding variable is a variable, other than the independent variable that you're interested in, that may affect the dependent variable. This can lead to erroneous conclusions about the relationship between the independent and ...

science
An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference ...

Math
The function f given by f(x) = x^3 + 12x – 24 is? Increasing for all x's? Cause that's what I think..

Chemistry
Calculate the solubility (in g/L) of calcium fluoride in water at 25°C if the Ksp for is 1.5 × 10-10 .

American National Government
Since the 1930s, when the federal government became more involved in domestic policy functions, federalism has come to be understood as a relationship in which the states are moresubordinate to the supreme power and authority of the national government. **So would the answer ...

American National Government
Despite the greater federal authority in the federal relationship, federalism is still important for all the following reasons except that: A)it provides the best means of developing a vast country because it allows for experimentation. B)it may stimulate the interest of the ...

POL 201
Despite the greater federal authority in the federal relationship, federalism is still important for all the following reasons except that: A)it provides the best means of developing a vast country because it allows for experimentation. B)it may stimulate the interest of the ...

POL 201
Actually the correct answer is "C" it impedes the authority of the government.

POL 201
Thank you Ms. Sue

POL 201
After reading this link, would it be All basic protections were contained in the Constitution?

POL 201
The federalists argued that a Bill of Rights was not necessary because? A. All basic protections were contained in the Constitution. B. the anti-Federalists were being irrational. C. it impedes the authority of the government. D. it would take too long to ratify.

english
3. In “The Pigman & Me,” the author creates a mood of suspense by focusing most of the action around a fight between two boys at school. a tree cut almost to its heart. Nonno Frankie’s advice to Paul. concerns about how a girl will react.

language arts
Which of these best states Nonno Frankie’s main idea of how to win a fight?

physics
what is the t shirts vertical componet of its velocity at launch? if it launches straight at 45° above the horizontal plane at 141 /s?

physics
car doing 60 mph and skids for 52.3 meters what is the speed at end of skid co/friction is 0.693 urgent help please

science
52.3 meters co of friction is .693

science
car doing 60 mph skide for 52.3 mts what is the speed at end of skid

Statistics
a Rollercoaster's auditors estimate that the average daily loss from those illegally riding without tickets is at lease (greater or equal) \$295, but wants to determine the accuracy of this statistic. The company researcher takes a random sample of losses over 64 days and ...

english
Which sentence contains a proper noun? (1 point)The boy quickly ran ahead of his mother to get to school. My dog plays all afternoon with the neighborhood kids. The sweater Tanya wore today was not warm enough. Birds or fish would be a good place to start for a research project

math
I know this sounds stupid and fake, but smartone is right.

la
^^^ If they did you would fail because you would be copying someone else's answer.

Language Arts
Okay let me stop all these liers unless it changes every now and then, the answers are: B A D C

math
the height of a ball thrown vertically upward from a rooftop is modelled by h(t)=-5t^2 +20t+50. Determine the maximum height of the ball.

Physics
Consider tension force on rope. When ball/cart is not moving, T = mbg. If ball swings to an angle theta, O, then the y-component of T is mbg cosO. The cart is also pulling on the crane of the rope with a Fapp that is opposite to the x-component of the T (mbg sinO). Newton'...

Physics
A cart of mass m (including the mass of the crane) has a pendulum hanging from a crane attached to the cart. There is no friction due to the normal force, u = 0, or wheel bearings of the cart wheels. The cart is experiencing and applied force to the left of 10N. The ball at ...

math(fractions)

math(fractions)
what is 9/10 times 25/6.i got 225/60 but its not on my answer sheet.i need to simplify. It's not on my answer sheet. please help. its a puzzle.

Physics
Edit: Part 2 Find the angle of the third displacement.

Physics
A particle undergoes three displacements. The first has a magnitude of 15 m and makes an angle of 40 ◦ with the positive x axis. The second has a magnitude of 6.2 m and makes an angle of 158 ◦ with the positive x axis. After the third displacement the particle ...

Math Help
So the answer would be x = -10√1-y) + 2 or (96 + 4x - x^2)/100?

Math Help
Find the inverse of the following function algebraically. Show all work. f(x)=-5√-4x+4+2

science
@INCA student Thanks.

math
Milk was purchased for \$48.00. Due to the price increases, this was 2.3 times the cost of milk two years ago. What was the cost of milk two years ago?

Pre-Calculus
I'm kind of stuck on how to do this. Can someone help me? Thanks! Write the equation of the line with slope -2 that passes through the point (-1, -3) in slope-intercept form.

math
Which set of points are on the line y = 6x - 1? {(0, -1), (29, 5)} {(0, -1), (5, 29)} {(-1, 0), (29, 5)} {(-1, 0), (5, 29)}

math
Identify the solution(s) of the system of equations, if any. 6x + 4y = 0 y = 3 - 3x (–3, –2) (–3, 2) (–2, –3) (2, –3)

math
Simplify. (6x)2

algerbra
Identify the solution(s) of the system of equations, if any. 6x + 4y = 0 y = 3 - 3x (–3, –2) (–3, 2) (–2, –3) (2, –3)

math
Identify the solution(s) of the system of equations, if any. 6x + 4y = 0 y = 3 - 3x

math
Identify the solution(s) of the system of equations, if any. x + 3y = 7 6x - 9y = 6

algerbra
Identify the solution(s) of the system of equations, if any. -4x - 4y = 4 12y = -12x - 12 no solution (0, -1) (-1, 0) infinitely many solutions

math
Consider the following system of equations. y = 2x - 2 y - 2x = 7 What can you conclude about the system of equations? The system of equations is inconsistent. The system of equations is dependent. The system of equations is independent. none of these

algerbra
Which set of points are on the line y = 6x - 1? {(0, -1), (29, 5)} {(0, -1), (5, 29)} {(-1, 0), (29, 5)} {(-1, 0), (5, 29)}

math
A clothing store offers a 60% discount on all purchases. What is the discount in dollars (before tax) for an item originally costing \$18.00 dollars?

math
the expression that is equivalent to -6(x - 6).

algerbra
The temperature on one day in January for Phoenix, AZ, is 56 degrees Fahrenheit. On the same day in Barrow, AK, the temperature is -31 degrees Fahrenheit. What is the difference between these two temperatures?

Calculus
Two points P and Q are connected by a straight road of length d. At time t = 0, a car starts driving from P to Q at a constant speed c. At t = 0, a bee starts flying from Q toward the car at a constant speed b > c, and takes a zig-zagging path, reversing direction each time...

thank u
thank u steve

identify a value of x for which sum of 3+x is positive

when x is nonzero integer the sum 0f 3+x is sometimes negative and sometimes positive. Identify a value of x for which the sum of 3+x is negative.

Language Arts
Which sentence contains a proper noun? (1 point)The boy quickly ran ahead of his mother to get to school. My dog plays all afternoon with the neighborhood kids. The sweater Tanya wore today was not warm enough. Birds or fish would be a good place to start for a research ...

math
dentify the solution(s) of the system of equations, if any. 3x-2y=6 5x=5-25y

algerbra
Identify the solution(s) of the system of equations, if any. -3x-4y=2 8y=-6x-4

algerbra
Identify the solution(s) of the system of equations, if any. x=1 y=1

algerbra
Identify the solution(s) of the system of equations, if any. 3x+2y=4 5x-4y=3

algerbra
Identify the solution(s) of the system of equations, if any. -3x-4y=2 8=6x-4

math
At the school carnival, Carmen sold 3 times as many hot dogs as Shawn. The two of them sold 152 hot dogs altogether. How many hot dogs did Carmen sell?

math
Identify the solution(s) of the system of equations, if any. -2x - 4y = 8 8y = -4x - 16

algerbra
Consider the following system of equations. y = 4x - 4 y - 4x = 3 What can you conclude about the system of equations?

algerbra
A line passes through the points (-10,-4) and(-1,2) . What is the y-intercept of the line? a)(0,8/3) b)(8/3,0) c)(0,-4) d)(-4,0)

algerbra
Which of the following is an equation of a line that passes through the point (0, 5) and has a negative slope? y = 5x + 5 y = 5x y = -5x - 5 y = 5x - 5 y = -5x + 5

algerbra
thats not one of the answers

algerbra
A plumber charges customers \$48 for each hour worked plus an additional \$9 for travel. If h represents the number of hours worked, which of the following expressions could be used to calculate the plumber's total charge in dollars? 48 + (9 * h) 48 + 9 + h (48 * 9) + h 48...

algerbra
The temperature on one day in January for Phoenix, AZ, is 54 degrees Fahrenheit. On the same day in Barrow, AK, the temperature is -17 degrees Fahrenheit. What is the difference between these two temperatures?

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