Posts by sarah

Total # Posts: 6,129

1. Math

sin(arctan(-3pi/4))
2. Pre calc

You are standing at the peak of a mountain that is 14000 feet above sea level. The angle of depression from this peak to a nearby smaller peak is 4°. On your map, these two peaks are represented by points that are 1 inch apart. If each inch on your map represents 1.2 miles...
3. physics

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +3.9 m/s and ax = +1.2 m/s2. The y components of the puck's initial velocity and acceleration are ...
4. physics

Suppose a car is traveling at +15.0 m/s, and the driver sees a traffic light turn red. After 0.405 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 6.00 m/s2. What is the stopping distance of the car, as measured from the point where...
5. physics

(a) What is the magnitude of the average acceleration of a skier who, starting from rest, reaches a speed of 10.5 m/s when going down a slope for 3.18 s? (b) How far does the skier travel in this time?
6. physics

Two identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 44.7 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun...
7. physics

A car is traveling at a constant speed of 25.5 m/s on a highway. At the instant this car passes an entrance ramp, a second car enters the highway from the ramp. The second car starts from rest and has a constant acceleration. What acceleration must it maintain, so that the two...
8. math

I really need help to find the answer to this question below. If possible, please show every step of the way in a detailed form so i can understand, it takes me a while to fully comprehend whats being done. Thank you so much. QUESTION: the data shown model the growth of a ...
9. Math

There's a question I've been having difficulty solving, and I would really appreciate if you can show he steps to how I can achieve the answer. QUESTION: The numbers 1, 4, 10, 20, and 35 are called tetrahedral numbers because they are related to a four sided shape ...
10. Math

There's a question I've been having difficulty solving, and I would really appreciate it if you can explain to me how I can achieve the answer. question:an above ground swimming pool in the shape of a cylinder, with diameter 5m, is filled at a constant rate to a depth ...
11. Math

How do you multiply 2 square roots?
12. English

Hi so I read the book The Impossible Rescue by Martin Sandler and I need 3 main ideas and 3 pieces of evidence for each can someone help me I am having a really hard time?
13. Chemistry

25cm^3 H2SO4 is neutralized by 40 cm^3 of 0.03 mol/dm^3 KOH. What is the molar concentration of H2SO4?

Begins*
15. Math

Write an equation and for each sine function described. Each cycle behind at the origin. a) amplitude=6, period=180 b) amplitude=2, period=540
16. Math

Thank you so much! This was so helpful! Really appreciate it
17. Math

A Ferris wheel has a radius of 35m and starts at 2m above the ground. It rotates once every 53 second. a) determine the cosine equation of the graph, if the rider gets on at the lowest point. b) what is the height of the rider at 81 seconds?
18. Physics

What is the angle between the vectors A and B if vector A multiplied by vector B = 0.5 AB
19. Chemistry

If 32.6 mL of 0.240 M oxalic acid are required to titrate 48.9 mL of unknown sodium hydroxide: How many moles of acid are used in the titration? How many moles of base are used in the titration? What is the molarity of the unknown NaOh base? Please help I do not know where to ...
20. environment

hey, i have been selected to attend a training abroad but have to pay for travel myself. I need some good place to get travel grants for this. does anyone know where I can apply?
21. st joan of arc

Math from a spot 60 ft from the base of a building the angle of elevation is 48 degrees and the of elevation of the top of the antenna is 56 degrees. What is the height of the building? What is the height of the antenna?
22. obamoruf math

find the permeter of a parallelogram whose base is 6cm and side 5cm
23. english

COMMUNITY EAST HOSPITAL To call a Patient Dial Direct 395-8 Plus Room Number EMERGENCY ROOM……………….(NNN) NNN-NNNN/p> Main Number 1700 W 7th………………………395-8100 Billing Department…………...

26. Physics

Boxes A and B are in contact on a horizontal, frictionless surface. Box A has mass 21.0 kg and box B has mass 8.0 kg . A horizontal force of 100N is exerted on box A. What is the magnitude of the force that box A exerts on box B?
27. Physics

A grasshopper leaps into the air from the edge of a cliff at a 50 degree angle. He reaches a maximum height 6.74 cm above the top of the cliff and travels a total horizontal distance of 1.06 m. How tall is the cliff and what is the initial speed of the grasshopper?
28. algebra

what percentage is 90th percentile?

Draw a quick picture for 26+8. Show how to make a ten to model the number of apples a different way. Write a new number sentence I did 26 + 8 apples .. I drew 8 apples = 34 then I put 7+ 3 = 10 ?

Can you help with the other one I posted ?

draw a new quick picture for pablo's apples. show how to make a ten to model the number of apples a different way. write a new number sentence. 4 + 6 = 10 ?
32. physics

At what height above the ground must a body of mass 10kg be situated in order to have potential energy in value to the kinetic energy possessed by another body of mass 10kg moving with a velocity of 10m-s
33. English plz help quick

I am pretty sure this is a metaphor
34. Maths

Let f(x)= 2x+1 and g(x) = 3x^2-4 find: a) f^-1 b) gof (-2) c) fog (x)

4 is c for connexus students trust me
36. Calculus

Problem: Find the general solution to the following differential equation: x y' +x = ycos(1/x) I assume that you do separation of variables here: x(dy/dx) +x = ycos(1/x) xdy+x = (ycos(1/x)) dx ....? I'm stuck on how to simplify this. Thank you!
37. Science

Use the word INDEX OF REFRACTION in a sentence?
38. Science

Use the word ANGLE OF REFRACTION in a sentence?
39. ela

What does this mean? 'Immigrants have changed america,but america has also changed them"
40. ela

Immigrants have changes america, but america has also changed them what does this mean you can read the article Holding on to heritage before it slips away Thanks
41. Molecular Biology

How large is the genome of Alcaligenes faecalis?
42. Science

Water molecules are smaller and have less mass than alcohol and oil molecules. Explain why water is more dense than alcohol and oil.
43. Calculus

The function g is defined for x>0 with g(1)=2, g'(x)=sin(x+1/x), and g"(x)=(1-1/x^2)cos(x+1/x). A. Find all values of x in the interval 0.12<=x<=1 at which the graph of g has a horizontal tangent line. B. On what subintervals of (0.12,1), if any, is the graph...
44. Calculus

Consider a differentiable function f having domain all positive real numbers, and for which it is known that f'(x)=(4-x)x^-3 for x>0. A. Find the x-coordinate of the critical point of f. Determine whether the point is a relative maximum, a relative minimum, or neither ...

12 1/2
46. Physics

A sled mass of 40 kg is pulled along a snow covered surface. The coefficient of static friction is 0.40 and the coefficient of sliding friction is 0.25 a) what force is needed to start the sled moving? b)what force is needed to start to keep the sled moving at a constant speed...
47. Physics

A sled mass of 40 kg is pulled along a snow covered surface. The coefficient of static friction is 0.40 and the coefficient of sliding friction is 0.25 a) what force is needed to start the sled moving? b)what force is needed to start to keep the sled moving at a constant speed...
48. math

After spending 80% of her money Lei has 100.00 left...How much was her money before?

ok thanks
50. Math

2(-8-2+2v+6v) do u distribute?
51. Math

thanks I get it now. Can u help me with another one? ms. sue

-9(8+4v)
53. Chemistry

I'm assuming for the first question you meant molar concentration.. if this is the case use the formula c=n/v (or concentration equals mass divided by volume) so you would first find the molar mass of sodium bicarbonate (i'm assuming you know how to do that) and use ...
54. I hate science

I hate science and I am not good at it no offense to science lovers
55. science

I think its elastic potential no hard feelings
56. Math

You draw five cards from a standard deck of 52 cards. P(heart) = 4/5 (fraction). What type of probability is illustrated and why? Theoretical; the result is based on the number of possible outcomes** Theoretical; the result is found by repeating an experiment Experimental; the...

so 336?
58. maths

simplify 8C5 The "C" stands for combinations ( like combinations and permutations )
59. ANT101

No, you don't need to include a citation.

Prove (sin4x)/(1-cos4x) = cotx - 1/2(cscxsecx) Please help me get started on this question... I'm at a lost as for what to do first....
61. chemistry

I think you use the formula q=mc(delta)t with q being the amount of energy added, m being the mass of water,c being the specific heat capacity of water which is 4.18J/g*degrees Celsius and then you would solve for delta t which is your change in temperature... hope this helps ...
62. Math

thanks so much!! :) ;) @ms. sue

150 @ms sue
64. Math

Anna saved \$20 in a jar each month for 2 1/2 years. She spent 75% of her savings on a computer. How much money did Anna have left in the jar?

Thank you for your help! (=

How can you determine if the given lines are perpendicular? Line 1: (-1,3) and (3,-3) Line 2: (-3,0) and (3,3) A)determine if they have slopes with opposite values*** B)determine if they have the same slope C)determine if the product of their slope is 1 D)determine if the ...

Which of the following does not reduce water pollution? a) cleaning up oil and gasoline spills. b) reducing pollutants such as pesticides and fertilizers. c) increasing the use of gasoline.*** d) properly treating waste water Can you please check my answer?
68. Math

A number cube is rolled 160 times. The number 2 comes up 39 times. what is the experimental probability of rolling a 2? What is the theoretical probability of rolling a 2? A. 39/160 ; 1/80 b. 1/6 ; 39/160 C. 39/160 ; 1/6 D. 121/160; 1/6 My answer is B. Is this right????
69. History

. Imagine that you are a British industrial worker who fell asleep in 1833 and awoke mysteriously eighty years later, in 1913. What, if anything, is still recognizable from your own life?
70. Social Studies I NEED HELP PLEASE!!!

Whoever the first person was who helped me, thanks! I got them both right! (=
71. Social Studies I NEED HELP PLEASE!!!

Oh, yes! I didn't catch that!

Thanks! (=
73. Social Studies I NEED HELP PLEASE!!!

I think 1 is b and 2 is d, but can someone please check my answers?
74. Social Studies I NEED HELP PLEASE!!!

Which best describes how land ownership changed after Ukrainian independence? A. land ownership has stayed the same B. lands formerly owned by the state have been privatized. C. lands formerly owned by individuals have been seized by the state D. communities own and work farm ...
75. Calculus

People are entering a zoo at the rate of 100e^t+75t people per hour where t is the amount of time the zoo has been open on that day measured in hours. If the doors are open at 9:00 AM, how many hundreds of people have entered the zoo at 11:40 AM? (Nearest integer)
76. Civics

12. Which one of the following is an example of an entitlement? A. Freedom of speech B. Receiving Social Security C. The right to vote D. Serving in the military B?
77. Civics

11. To become a citizen of the United States, you must A. file a request form in a federal court. B. pass an English and government test. C. have lived in the United States for at least six months. D. be at least 21 years old. B?
78. Civics

10. Which of these statements about the Cuban Missile Crisis is true? A. President Kennedy removed nuclear missiles from Turkey to resolve the crisis. B. Fidel Castro's government had manufactured guided missiles. C. President Kennedy called Nikita Khrushchev on the ...

80. Civics

I've looked up Madison and I think I'll agree on this answer than I would Washington because for Washington it doesn't say that he was known as a federalist.
81. Civics

Ohh then I don't know. For sure I know it can't be George Washington and not Abraham Lincoln.
82. Civics

5. You don't really approve of the idea of political parties. However, you're known as a Federalist and are soon associated with that party. Chances are good that your name is A. Thomas Jefferson. B. James Madison. C. Abraham Lincoln. D. George Washington. A?
83. Civics

4. Which one of the following individuals would be most likely to vote? A. A 50-year-old corporate executive who holds a master's degree in business B. A 30-year-old college graduate who has just moved to a new state C. A 19-year-old high school graduate who likes to ...
84. Civics

3. If you were a specialist working for the National Security Agency, your main job would likely be A. analyzing and breaking coded messages. B. working in the field to carry out covert operations. C. analyzing data from spy satellites. D. electronic surveillance. My sister ...
85. Civics

Sorry I couldn't find that page and thought that I should ask once more sorry.
86. Civics

1. A basic position in American foreign policy has been that America must defend its foreign interests related to trade and security. The main foreign policy position opposed to this American policy is called A. imperialism. B. militarism. C. isolationism. D. federalism. C?
87. Calculus

A circle has a radius lf 10/(pi-1) which is the same value as the side of a square. Both the radius of the circle and the side of the square are gowing at 1 in/sec. Find the difference between the rates of change of their area in in/sec.
88. social studies

Why is John Mosby an important figure of the cival war? (If you can, please put them in a list and I need the most important facts) thankyou :)
89. Civics

Well yes of couse :)
90. Civics

"a policy of remaining apart from the affairs or interests of other groups, especially the political affairs of other countries."
91. Civics

If not A,my sister said C isolationism.
92. Civics

In my book it says imperialism is aimed at controlling foreign trade by holding colonies and defending them against other foreign powers.
93. Civics

1.   A basic position in American foreign policy has been that America must defend its foreign interests related to trade and security. The main foreign policy position opposed to this American policy is called  A. imperialism. B. militarism. C. isolationism. D...

Koloshuk???
95. Science

Am a Jehova Witness we only believe in God not this evolution bullsh*t.