1. Physics

A small car (mass 380 ) is pushing a large truck (mass 1000 ) due east on a level road. The car exerts a horizontal force of 1580 on the truck. What is the magnitude of the force that the truck exerts on the car?

2. Hypothesis - Statistics

At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a

3. statistics

The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses more than 350 minutes?

4. chemistry

The Ksp for calcium fluoride (CaF2) is 3.9 x 10^–11 at 25°C. How many moles of solid NaF must be added to 1.00 L of 0.100 M CaCl2 in order to precipitate CaF2? Please help me set up this ICE table and understand how to solve this!! thank you!!

5. statistics

According to a Harris Interactive poll conducted in 2009, 20% of American adults smoke. In a random sample of 500 American adults, what is the probability that no more than 100 smoke?

6. chem 1

Okay there is a question in my book, but go figure it's one that doesn't have the answer in the back of the book for me to check my answer. it says predict the effect each change has on the solubility of (1)Na2CO3(s); (2)N2(g) a. increase in temperature b.

7. math

A radio transmission tower is 170 feet tall. How long should a guy wire be if it is to be attached 7 feet from the top and is to make an angle of 30° with the ground? Give your answer to the nearest tenth of a foot

8. chemistry

An aqueous solution is made using 137g of diluted to a total solution volume of 1.30L .Calculate the molarity.molality and mass percent of solution.*assume a density of 1.08g/ml for the solution..

9. algebra

A total of $6200 is deposited into two simple interest accounts. On one account the annual simple interest rate is 2%, and on the second account the annual simple interest rate is 4%. The amount of interest earned for 1 year was$148. How much was invested

10. statistics

Expected relative frequency probability represents a calculated probability based on large numbers of trials. In an example of a deck of 52 cards, where you randomly pull cards from the deck and record what they are, you find that over 1000 random draws,

11. statistics

(3,5,7,9,11)U(3,6,9,12,15) would correctly be expressed as

24. Explanation of Maths B Question

An example of a wine glass design, using three equations, is given below. The base of the wine glass is defined by a quadratic equation, the stem by a linear equation and the body of the glass by a square root function. The difficult part of the

25. Persoanl finance

1. Jenny Franklin estimates that as a result of completing her master’s degree, she will earn $7,000 a year more for the next 40 years. a. What would be the total amount of additional earnings? 40 yrs * 7,000/ yr =$280,000 I don't understand how to get

26. Hea;th

Empty calories are defined as ________. A. Calories from dairy products only B. Calories from low-fat foods and/or fruits and vegetables C. Calories from water and other foods or beverages that have zero calories D. Calories from solid fats and/or added

27. Maths-Trigonometry

a kite is attached to a string that is 15m long. If the string makes an angle of 26 degrees to the horizontal the height of the kite is.

28. SCIENCE

chemical formula for Fe + ZnSO4

29. science

a canoe displaces 100 L of water weighs 9.8 NL what is the bouyant force on the canoe

30. Health

The U.S. government categorizes body weight status as ________. A. Underweight, healthy weight, overweight, obese B. Healthy, unhealthy C. Underweight, healthy, overweight D. Thin, healthy, heavy, obese

31. health

Not eating breakfast has been associated with _________, especially among children and adolescents. A. Increased energy B. Excess body weight C. Losing weight D. None of the above i think its A

32. 11 Maths B

Design a wine glass that uses at least 5 different equations to form the outline of the shape. At least half of your equations must be curves. It is easier if the design is done with the glass on its side, that is, with the axis of the design running along

33. What does this Maths B question mean?

How do I do thi question? An example of a wine glass design, using three equations, is given below. The base of the wine glass is defined by a quadratic equation, the stem by a linear equation and the body of the glass by a square root function. The

34. statistics

Surgery vs. placebo for the knee pain: Refer to Example 10. Is Arthroscopic Surgery Better than Placebo? Here we show MINITAB output comparing mean knee pain scores for the placebo (group 1) to debridement arthroscopic surgery (group 2). a) State and

35. chemistry

Glutamate (Glu–) is the conjugate base form of glutamic acid (HGlu). The Ka of glutamic acid is 5.012 x 10^–5. You titrate 50 mL of 0.10 M sodium glutamate solution with 0.05 M HCl solution. Calculate the pH of the solution at the equivalence point.

36. Physics

3. A projectile is launched at 10.0 m/s in a direction 45.0 degrees above the horizon. It hits the ground 10.0 m below its initial position. What is its speed just before hitting the ground? Ignore air resistance. The answer is supposed to be 17.2 m/s.

37. statistics

it is stated that the standard deviation sample of the is 7.6 (n = 26). Test the claim to a significance level of 0.10 that the population standard deviation was greater than 7.0. Round all answers to 3 decimal places.

38. Health

A person’s daily sodium intake should be reduced to less than ________ milligrams and further reduced to ________ milligrams among persons who are 51 and older and those of any age who are African American or have hypertension, diabetes, or chronic

39. PHysics

What is the total energy of a 15-kg mass attached to a spring oscillating horizontally with an amplitude of 20 cm and an angular frequency of 32 rad/s?

40. English

Antonyms of: Careful: False: ignorant: A: uneducated B: reckless C: intelligent D: untrue E: Genuine I think careful is B false: E ignorant: A

41. MATH

2,100 LOAN AT 13% ADD ON INTEREST FOR 3 YEARS. HOW DO I CALCULATE THE APR?

42. Maths B question - population

The population P of a particular city, Metropia, is growing at a rate proportional to the current population. The population at time t years is modelled by the equation P = Aekt where A and k are constants. (a) With the aid of appropriate examples, explain

43. Literacy

Which one of the following services is provided through the Ask-a-Librarian feature in the Penn Foster Library? A. An analysis of an issue presented in your course B. A historical date or the source of a quote C. An informed opinion on how to improve your

44. Algebra 1

The University of Selectivity had an acceptance rate of 20 percent for the year 2006, with an incoming class of 300 freshmen. Between 2006 and 2007, the number of applications they received increased by 30 percent, but the number of students admitted

45. Physics- Repost (Answer did not make sense)

In the circuit below, at time t = 0, the switch is closed, causing the capacitors to charge. The voltage across the battery is 12 V The circuit: flickr. com/photos/ 68751220@N03 /6848519773/ A)Calculate the time constant for the RC circuit B)Calculate the

46. Math

I am wondering how to get the answer 4324 by multiplying 25.11 *3.14 I am constantly getting different answers the answer i am consistently getting is 8284.84 and 7944.54 I really need help!

47. Algebra

Solve using set builder notation, show all work. 12x-25 is greater than or = to 3x-5(x+6)

48. MAth!

In the list of five measurements shown below, one is blurred. Supply a fifth value that would make the median 8. 8 5 10 3 #

49. health

identify two key health care related challenges of the aging population such as increase in health care cost, increase in prescription drug cost or the need for in home medical care

50. calculus

So I am suppose to evaulate this problem y=tan^4(2x) and I am confused. my friend did this : 3 tan ^4 (2x) d sec^ 2x (2x)= 6 tan ^4 (2x) d sec^2 (2x) She says it's right but what confuses me is she deriving the 4 and made it a three? I did the problem like

51. does anyone

known the architect of the Mosque of Ibn Tulun ?

52. medical transcription

Could someone review this and make sure it appears to be correct? Had a repeat magnetic resonance imaging (MRI) of the head. She had a lesion seen in the right frontal lobe on previous computed tomography (CT) and MRI scanning. This lesion has not changed

53. Explanation of Maths Question

Can someone please explain what does these questions mean? Design a wine glass that uses at least 5 different equations to form the outline of the shape. At least half of your equations must be curves. It is easier if the design is done with the glass on

54. math

Frank's cell phone package costs $20 per month and an additional$0.05 per text. Josie pays $15 per month and$0.10 per minute. Determine the linear system that could be used to find out when their monthly bills would be the same.