Posts by hannah

Total # Posts: 3,512

1. 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?
2. social studies HELP

I NEED HELP MS.SUE
3. 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?
4. Algebra

do I use the quadratic formula to find the two x values?
5. 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...

jean
8. Chemistry

What is the volume of 1.25 lb of mercury? The density of mercury is 13.546g/mL.
9. 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...
10. 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.. ...
11. 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?
12. 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

14. 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

16. 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?
17. 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
18. math

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

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

A regular hexagon has sides of 5 feet. What is the area of the hexagon
21. 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?
22. 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...
23. math

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

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

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

it says that is wrong
27. 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
28. 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...
29. 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 ...
30. 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.
31. science pls help asap!!!

Thank You Anonymous i got a 100% thank you so much!!
32. math ~dont know all but check some~ pls help!!!

the answers are if ur looking for them 1. A 2. B 3..A 4. D 5. C 6. C 7. A 8. C 9. ESSASY
33. 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 ...
34. 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.
35. H.E.L.P

Thanks Josslyn I got a 100%
36. Science help ASAP

Thanks guys 1.D 2.B 3.A 4.A
37. Chemistry

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

X+3÷9-X^2
39. 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^...
40. Math

There are 92 boys. There are 14 fewers girls. How many are the girls are there?
41. Language Arts

Nevermind, i got it. You guys are slow
42. 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 ...
43. URGENT Physics help

Thanks Jerome!!!!
44. URGENT Physics help

Positively charged Object A is brought close to neutral Object B but does not touch it. The two objects begin to attract each other. What is this process called? (Points : 1) grounding charge polarization conduction repulsion 4. How many coulombs could be in a lightning bolt...
45. biology 6

the giant anteater of south america, the giant armadillo of north america, the giant pangolin of Africa and the spiny anteater of Oceania share many characteristics. They all eat ants, have long narrow snouts, few teeth and large salivary gland, yet they do not share a common ...
46. biology 5

which of the following is correct? A. mitosis results in 4 identical daughter cells B. meiosis is used for the production of gametes C. cells go through two series of divisions in mitosis D. daughter cells produced by meiosis contain the same number of chromosomes as the ...
47. biology 4

one strand of DNA could be as long as a football field if it were stretched out lengthwise. One of the factors allowing DNA to fit inside the nucleus of a cell is its ability to: A. break apart into separate genes B. extend to form very long, thick molecules C. coil tightly ...
48. biology 3

the curled ears of the american curl cat are caused by an autosomal dominant allele. What are the chances of a heterozygous female and a homozygous recessive male producing offspring with curled ears?
49. biology 2

which organelle produces proteins? A. nucleus B. lysosome C. ribosome D. Golgi body
50. biology

Intravenous saline injections are often given as a treatment for severe dehydration. the concentration of saline (0.9% NaCI) in these injections is that same as that present in human cells. what would happen if pure water was introduced into the the body instead of saline?
51. Chemistry

For number 1, I was wondering how would you exactly link the structures together? In the form of tris and trans?
52. Chemistry

1. How would you sketch the probable products of the reaction of the cis and trans with each reagent other than AgNO3? _____ with en _____ with NH3 ____ with KSCN cis: trans: (NOTE: What are the differences between cis and trans and its formation?) 2. How exactly would you ...
53. Language Arts

1. A factory might EMIT A. Pollution B. Smokestacks C. Resources 2. How do the members of Don't Be Crude make a persuasive appeal? A. By embarrassing people B. By educating people C. By encouraging people D. by making people laugh 3. What did Gina Gallant NOT have to do to...
54. econ

In January 2012, one US dollar was worth 50 Indian rupees. Suppose that over the next year the value of the Indian rupee decreases to 60 Indian rupees to one US dollar. Suppose also that the price level of all goods and services in India, as measured in rupees, falls 20%, so ...
55. Math

answers A b b c b
56. physics

Astronauts in space cannot weigh themselves by standing on a bathroom scale. Instead, they determine their mass by oscillating on a large spring. Supppose an astronaut attaches one end of a large spring to her belt and the other end to a hook on the wall of the space capsule. ...
57. physics

A compact car has a mass of 1150 kg. Assume that the car has one spring on each wheel, that the springs are identical, and that the mass is equally distributed over the four springs. (a) What is the spring constant of each spring if the empty car bounces up and down 2.2 times ...
58. physics

The acceleration due to gravity on the moon is 1.62 m/s2. What is the length of a pendulum whose period on the moon matches the period of a 4.00-m-long pendulum on earth?
59. Math

How many possible combinations are there if a spinner with 4 sections is spun twice?
60. Global Studies

Oh yeah . I just re read. A?
61. Global Studies

Which of not following is NOT associated with El Nino? A. Fish that thrive in cold Pacific waters are driven away. B. Areas that usually have dry weather get heavy rains or are flooded C. Drought plagues certain peoples in South America D. All of the above are associated with ...
62. Chemistry

Heather is correct. Atta girl Heather. You da real mvp

0.8132
64. Chemistry

What is the percent by volume concentration of a solution containing 300.mL of isopropyl alcohol and enough water to give 400.ml of solution?Which component is the solute and which is the solvent?
65. speech

do you have any examples?
66. speech

does a question of policy speech have to be on a law or policy? Or can It be persuading someone to do something (like volunteer, or encouraging them to graduate debt free)
67. help with math!!!!

Thank you so much can you help me with couple more?
68. help with math!!!!

Oh yeah sorry. i didn't see it. for number one it was 3x-y=19
69. help with math!!!!

Oh thanks ! and for number one that's how the equations was written
70. help with math!!!!

I don't get it. What do you mean?
71. help with math!!!!

Solve each system using substitution. Tell whether the system has one solution, infinitely many solutions, or no solution. 13. -x + y = -13 3x - 1 = 19 15. 1/3y= 7/3 x + 5/3 x - 3y = 5 17. 3x + y = -13 -2x + 5y = -54

Please help me with science genetics questions? Thanks to all who answer!! :) 1. Chromosome pairs contain different versions of genes, which are called ________. 2. The process in which body cells are duplicated in order to grow and repair body tissues is called _____________...

-gives up-

T_T

76. Science, Genetics

Please help me with science genetics questions? Thanks to all who answer. :) 1. Chromosome pairs contain different versions of genes, which are called ________. 2. The process in which body cells are duplicated in order to grow and repair body tissues is called _____________. ...

for number one 1 was also thinking a, and number 3 a?

1. Why are the Prairie Provinces known as Canada's breadbasket? (1 point) a. more than three-quarters of Canada's farmland is located there b. the people of these provinces love bread c. it has many famous bakeries d. that is the translation from the Cree name for it...
79. trig

a kite is flying at an angle of elevation of about 40 degrees. all 80 meters of string have been let out. ignoring the sag in the string, find the height of the kite to the nearest 10 meter
80. social studies

i need help on social studies week 15 i cant get it so i used my laptop for help and its kinda working you should try it is kinda cheating but its used to
81. Physics

This exact queston is on my edenuity...thank you
82. Math

A wire to the top of a tower makes an angle of 52 with the le el ground. At a point 32 ft. Farther from the base of the toser and in líne with the base of the wire, the angle of elevation to the top of the toser is 21. What is the length of the tower.
83. Science

So all of them were right except the last one?
84. Science

1. How does groundwater cause erosion and deposition? a. When acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves. *** b. When a river overflows, it moves downhill, resulting in the formation of caves. c. When it rains, water ...
85. world history 2

Oh lol I hate school and I am definetly not good at it so...
86. world history 2

thanks ur a life saver lol and i have no idea how they caught up with Philadelphia and Boston lol
87. world history 2

plz hurry I only have 7 minutes to finish this.
88. world history 2

ok next Canal question. Who built the Erie Canal why and with what technology?
89. world history

could u guys plz help me with my other question called world history 2
90. world history

ok thanks guys ur awesome! :D
91. world history

who built the suez canal why was it built and what technology was used?
92. Math

Adult tickets for the school play cost \$5 and student tickets cost \$3. Thirty more student tickets were sold than adult tickets. If \$1770 was collected, how many of each type of ticket was sold?

Which of the following terms refers to legal protection provided against copying, distributing, performing, or changing both published and unpublished works? a. Intangible property b. tangible property c. copyright****** d. intellectual property What is piracy? a. The use of ...
94. Science

Which of these statements about saltwater is correct? a. Saltwater freezes at a lowers temperature? b. Saltwater freezes at a higher temperature c. saltwater does not freeze at any temperature d. saltwater freezing point depends on the temperate of ocean floor***
95. Chemistry

Aerosol cans contain com- pressed gases that, when released, help propel the contents out of the can. Why is it important to keep aerosol cans from overheating?

C2h4o
97. Language Arts

Directions: Read the poem and answer the questions that follow. Fossil Flitting, flickering, flashing black, white, and a note of red passes beneath trees that were already old at the end of the Civil War. The lovely departed species announces its fearless refusal to cease to ...
98. English

What is the action verb for the following sentence- For this pottery they use two kinds of clay.
99. Engish

Never mind I got it.
100. Engish

True or false you can trust a dissembler? I do not understand it at all.