# Posts by hannah

Total # Posts: 3,347

Chemistry
How many mL of a stock 2.50M HCl solution are required to prepare 25.0 mL of a 0.15M HCl solution?

Chemistry
A certain reaction has an equilibrium constant of 0.65. Calculate the constant for the reverse reaction.

algebra. help!
Find the slope of a line that passes through (-2,-3) and (1,1). a. 1/3 b. 1 c. 2 d. 4/3 For the equation -4y=8x, what is the constant of variation? a. -4 b. -2 c. 1 d. 2 Suppose y varies directly with x, and y=24 when x=8. What is the value of y when x=10 a. 10 b. 30 c. 80 d.240

physical
I'm so confused

Chemistry
Identify the intermolecular attractive force(s) that must be overcome to vaporize CH3Cl(l).

math
20

organic biochemistry
Calculate the number of moles of ZnCl2, in 100. mL of 0.600M solution.

physics
A 755 N diver drops from a board 10.0m above the water's surface.Find the diver's speed 5.00 m above the water's surface. Then find the diver's speedjust before striking the water.

Science
centarl nervous system human being brain nerve tissue neurons

English
Compare and contrast the topics and themes of writers from the Americas and European writers.

english 10
I need help with this question as well, I'm choosing prompt A.

math
An estimate for -66

algebra. help!
Thank you so much!

algebra. help!
I choose c

algebra. help!
Start from 110 feet away, a person on a bicycle rides towards a checkpoint and then passes it. The rider is travelling at a constant rate of 30 feet per second. The distance between the bicycle and the checkpoint is given by the equation d=|110-30t| at what times is the bike ...

algebra. help!
1. 3x+10≥4 a. x≥-2 b. x≤ 2 c. x≤-2 d. x≥ 2 ** 2. The tennis team is selling key chains as a fundraiser. If its goal is to raise at least \$180, how many key chains must it sell at \$2.25 each to meet that goal? Write and solve an inequality. a. 2....

Physics
Two hockey players traveling at 12 m/s (Player #1) and 19 m/s (Player #2) hit in a head-on collision. They grab onto each other to keep from falling and slide in the same direction Player #2 was traveling at a speed of 5 m/s. Player #1 has a mass of 100 kg. What is Player #2&#...

Math
Hi I really need help. I don't know even how to figure these two questions out so if you could help me, please. Is (–4, 10) a solution to the equation 10 – 5x = y? Explain your answer. Describe the pattern in the table using an equation. x|y 1|15 2|25 3|35 4|45 ...

College Chemistry lab
No. I'm doing the questions in my lab manual and this is all the information I have. The lab is spectroscopic analysis of spinach. Test tube 1 has 9ml of 2.0M HCl and 1 ml of .00050M FeCl3 and 10ml of KSCN. But question asks for the concentration of iron lll before the ...

College Chemistry lab
How do I Calculate the concentration of iron(lll) with absorbance measurement. Wavelength is 480nm, solution is 1 ml FeCl3 : 9ml HCl, absorption is .250A, concentration of stock FeCl3 solution is 0.00050M and stock HCl solution is 2.0M. I not sure how to use beer's law to ...

Creative Title Help
yo mama eats fish too so stop overfishing

Physics
In the system shown in the figure, suppose the block has a mass of 2.7kg , the spring has a force constant of 500N/m , and the coefficient of kinetic friction between the block and the floor is 0.18. Find the work done on the block by the spring and by friction as the block is...

Science
A,D,C,C. All right:)

Algebra
A rectangular region with one side against an existing building is to be fenced in. Assume that there is 150 ft of material available. Since one side is the building, you will use your material to construct 3 sides of the rectangle.

math
Need help! The problem is: draw all the possible rectangles with a perimeter of 26 centimeters and whole number lengths of sides for each rectangle label the lengths of two adjacent sides. Dot array homework sheet. Thanks!

Chemistry
8.78 L

math
A painter earns \$15 per hour. What is the minimum number of hours he must work to earn at least \$200? Write an inequality to represent this situation and solve. Show your work.

history
1.) describe the primary economic activity for each of the tree colonial regions: The new england colonies, the middle colonies , and the southern colonies. explain how the gephraphary of each region helped determine its economy (6 points) @mrs.sue please help

social studies
1.) contrast the up country and the low country. identifiy three diffrences between the two regions (6 points) 2.) describe the primary economic activity for each of the tree colonial regions: The new england colonies, the middle colonies , and the southern colonies. explain ...

Social Studies
1.)c 2.)a or d 3.)c 4.)a 5.)b 6.)d 7.)b 8.)a 9.)? 10.)c 11.)d 12.)b Thoes are my answeres

Social Studies
1. The leaders of the Virginia Company recruited more settlers and reorganized the colony. They allowed the new settlers to own land. Those settlers began to grow tobacco, a crop they learned about from the Indians. By 1612, Virginians were shipping tobacco to England, which ...

Math
or sir ._.

Math
yes ma'am

Math
between were erika is standing to the vertical distance from the kite is 75 meters. how high is the kite in meters a.)125 b.)100 c.)25 d.)15 My answer is c am i correct ?

Science
1.)When evaluation was first processed which of the following was used as evidence to suport the idea (1 point) a.)observations of nature**** b.)laboratory experiments c.)extensive fossil collections b.)genetic sequence 2.)a farmer sprays insecticide on his crops and notices ...

science
6. I got C 10. I got B 11. I got C

math
The area of a circle is found with the formula A =〖πr〗^2, where π represents 3.14. If a tile artist is placing tiles in a circular mosaic pattern and the area of the circle is 658 square feet, what is the approximate radius of the circle in feet? a.)10...

History
im not really sure about this oen and i have read over and over agin what was the direct result of the Stono rebellion? a.)the passage of the slave code b.) the defeat of govern William bull c.) the exicution of the leaders of the rebelion d.) the creation of laws punish thoes...

History
thank you ms.Sue i have one more question do mine helping me ?

History
1.) why did most slave owners not want slaves to be educated? wouldn't it be they feared education would lead to revolts ?

Chemistry
Find the mass (in g) of Carbon in 2.980 g Carbon dioxide.

algebra 2
I found out that question 2 is the same equation so it can't be solved but I still need help with question 1.

algebra 2
Solve the following systems of equations. If the system cannot be solved ,state that it cannot be solved and explain why. 1.3x+y=7 3x+y=10 2. 5x-2y=-24 -4y=-48-10x

algebra. help!
i say false for 1, and for number 2 a?

algebra. help!
Is 4x-3=19 true, false, or open? Which of the following is a solution to the equation 16=4x-4? a. -5 b. -4 c. 5 d. 16

algebra. help!
Yeah^?

algebra. help!
is -7+9=-9+7 true false or open

English
Yes thank you!

English
The 'White House' has been home to many animals as well as presidents. (1 point) common noun proper noun compound noun collective noun

math
the expression that is equivalent to -2(x - 7).

algebra
1.Find an equation of the line that passes through (4,3) and is parallel to the line 3x-y=7. 2. Find the equation of the line through (4,3) perpendicular to the line 3x+y=7. Please show work so I know how to do it

physics
A barge is hauled along a straight-line section of canal by two horses harnessed to tow ropes and walking along the tow paths on either side of the canal. Each horse pulls with a force of 403 N at an angle of 12.9° with the centerline of the canal. Find the sum of the two ...

science
no

English
1.Indirect characterization 2.subconscious 3.travelers saw pterodactyls, bats, and a Tyrannosaurus Rex.

Algebra
Determine the value or values of d that complete the square for the expression. (a) x^2 + dx +64 (b) x^2 + dx +49/4

physics
You stand at the edge of a cliff, holding a ball out over the edge. You give the ball an initial velocity of 7.00 m/s straight up, releasing the ball when it is 17.0 m above ground level (the level of the ground at the base of the cliff). Use g = 10.0 m/s2, and neglect air ...

Science
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...

Science Plase help check my answers

Science Plase help check my answers
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...

Algebra 2
Reed has \$6.20 in nickels and quarters. If the nickels were quarters and the quarters were nickels, he would have \$3.50 more. How many quarters does Reed have?

english
It means that if you want to apply to this nursing program you can't have any other nursing experience, because this is for first-years only.

Algebra
The cost of purchasing x meter lengths of a certain rope is: C=1/5x^2-8x+100 per rope. What is the length of the cheapest rope that can be purchased?

algebra
True or false if the statement is not true give a counterexample. 1.If a>b,and c is positive, then ac>bc? 2.if a^2=b^2,then a=b? 3. If a>b,and c is positive,then a/c>b/c?

Algebra
do I use the quadratic formula to find the two x values?

Algebra
Find the value of x for which the area is a maximum: A = 800 + 20x - 1/2x^2

A man wants to create a Japanese garden with a parabolic footbridge to cross the creek in front of his garden. The bridge needs to span 5 meters and - according to the design he has selected - is 2 meters tall at the apex. Find a quadratic model that describes the shape of the...

world history
jean

Chemistry
What is the volume of 1.25 lb of mercury? The density of mercury is 13.546g/mL.

physics
Two identical small spherical conductors (point charges), separated by 0.6 m, carry a total charge of 200 mu or micro CC. They repel one another with a force of 120 N. (For the universal constant k use the value 8.99 times 109 N m2/C2.) so I used q1 + q2= 200e-6C and q1*q2= Fr...

geography
The alternative for the Americas agreement of the early 2000s is primarily aimed at... A) excluding the US from Latin America B) creating a Latin America Union C) inviting foreign investment from Asia D) improving ties with the European Union Can't find this anywhere.. ...

Chemistry
So since the four of them hybridize how do I write that? Do I just show 1s2 2s2 2p3? Also for an sp carbon is this electron configuration correct: 1s orbital up and down, 2sp orbital up and up, and 2p orbital up and up?

math
find d/dx of the integral from 1 to 2x of the (sqrt t^2+1)dt at x=sqrt2 the answer is 6. but i am not sure how to find d/dx. i tried taking the integral then doing that from 1 to 2x and then taking d/dx then plugging in sqrt2 for x but it was wrong

math

math
which of the following is true about the function g(x)= 4x^2 - 3x^4? a)g is decreasing for x<1 b) g has a relative extreme value at (0,0) c)the graph of g is concave up for all x<0

calc

calc
a rectangle is inscribed in the upper half of the circle x^2+y^2=a^2 calculate the area of the largest such rectangle. So A=2xy y=sqrt(a^2-x^2)A what do I do from there?

geometry
george has been hired to paint the smtihs house. he need to be sure that his ladder reach the highest point of the house, so he decides to use his shadow method the measuring stick is 3 ft and its shadow of the house is 45 the triangles are formed similar

math
what does the polar equation r=1/(sintheta + costheta) represent? how do I do this problem

math
The base of a rectangular prism is 6 inches - 9 inches. what is the lateral area of the prism

math
A regular hexagon has sides of 5 feet. What is the area of the hexagon

math
A picture frame is 18 inches long and 8 inches tall. It is 2 inches wide on all 4 side. What is the area of the picture frame?

science
A horizontal spring-mass system has low friction, spring stiffness 210 N/m, and mass 0.6 kg. The system is released with an initial compression of the spring of 11 cm and an initial speed of the mass of 3 m/s. suppose that there is energy dissipation of 0.02 J per cycle of the...

math
A square pyramid has sides of 8 m. Each face is an equilateral triangle. What is the lateral area of the pyramid?

math
What is the equation of the line that passes through (-2, 2) and (1, -4)?

math
what is the sum from 1 to infinity of ( 3n^3 - 4n^2 + 5)/(6n^5-2n+7)

math
it says that is wrong

math
The given curve is rotated about the y-axis. Find the area of the resulting surface. y = 3 − x2, 0 ¡Ü x ¡Ü 4

physics
One mole of titanium (6 1023 atoms) has a mass of 48 grams, and its density is 4.54 grams per cubic centimeter, so the center-to-center distance between atoms is 2.60 10-10 m. You have a long thin bar of titanium, 2.4 m long, with a square cross section, 0.11 cm on a side. You...

science
A moon orbits a planet in the xy plane, as shown in the figure. You want to calculate the force on the moon by the planet at each location labeled by a letter (A,B,C,D). At each of these locations, what are (a) the unit vector r, and (b) the unit vector F in the direction of ...

physics
Match the process with the fundamental interaction responsible for this process. 1)A falling object slows down from a great speed to its terminal velocity. 2)An apple is held off the ground by the surface of a table.

Science
1) A person roller skates down a street heading east. Which of the following would be true about friction in this scenario? a; friction does not affect the skates in the scenario b; friction pulls the skates wheels eastward c; friction pulls the skates wheels downward, toward ...

Science
Ms. Sue

Science
Which of the following best describes the movement of an object at rest if no outside forces act on it? a; it will move due to inertia b; gravity will eventually cause it to move c; it will stay at rest due to inertia d; it will stay at rest due to gravity...

Math
Sam Sounds received a \$320 discount loan to purchase a stereo. The loan was offered at 16% for 90 days. Find the interest in dollars and the proceeds for the following problem.

Chemistry
Fuel pellets are replaced in a nuclear reactor when the U-238 content drops to A. 4% B. 6% C. 50% d. 94%

algebra
X+3÷9-X^2

PHYSICS URGENT
2. A point charge of +1.0 µC is moved in the direction of an electric field, and it has a change in electric potential difference energy of 10.0 J. What was the change in electric potential difference? 1 µC = 10-6 C (Points : 1) -1.0 × 10^8 V -1.0 × 10^...

Math
There are 92 boys. There are 14 fewers girls. How many are the girls are there?

Language Arts
Nevermind, i got it. You guys are slow

Language Arts
Please check answers! Choose the type of punctuation that is missing from the following sentence It's no wonder that Mark is tired after staying up all night. A. APOSTROPHE **** B. SEMICOLON C. COLON D. HYPHEN Can't you just see the look on his face when he finds out ...

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