Most popular questions and responses by Help please!
1. ## GEOMETRY

The diameter of a circle has endpoints P(–10, –2) and Q(4, 6). a.Find the center of the circle. b.Find the radius. If your answer is not an integer, express it in radical form. c.Write an equation for the circle.

2. ## Algebra

Given the function rule f(x)=x^2-4x+3, what is the output of f(-3)? A- 24 B- 21 C- 0*** D- -3

3. ## Social Studies

1. Why did Henry the Navigator sponsor voyages of exploration? A. To establish colonies in the Americas B. To find better trade routes to Asia C. To search for gold and other riches D. To engage in the triangular trade Please help me I have no idea!

4. ## Math

Hi! My math teacher hasn't responded to me so I need help! The question is asking me to find lateral area of a pyramid, but I don't know the formula to do so.

5. ## Pre-Algrebra

3. 2x^2+6x-7x+8-3x^2+1 A. 2x^2+x+9 B. -2x^2-x-9 C. -x^2-x+9 D. x^2+9 4. What are the coefficents in the polynomial 4x^2+3x-3 A. 4,-3,-3 B. 4,3 C. 4,3,3 D. -4,-3 6. (7x^2-x-2)-(6x^3+3) A. 6x^3-+7x^2-x-5 B. -6x^3+7x^2-x+1 C. -x^3-x-5 D. x^2-x+1 7. Suppose

6. ## Math

A high-speed train makes a 360 mile nonstop run between two major cities in 712 hours. The train travels 80 mph in the country, but safety regulations require that it travel only 20 mph when passing through smaller, intermediate cities. How many hours are

7. ## Social Studies

How did the fall of communism most impact people in Eastern Europe economically? A. Privatization has allowed them to become entrepreneurs. B. Greater freedoms have enabled collective farming. C. Democratic elections have ensured more representative

8. ## Math!!!

Suppose Y is a continuous variable whose density gives the following probabilities: Pr{ Y < -3 } = 0.05 Pr{ -3 < Y < -1 } = 0.15 Pr{ -1 < Y < 0 } = 0.3 Pr{ 0 < Y < 1 } = 0.3 Pr{ 1 < Y < 3 } = 0.15 Pr{ Y > 3 } = 0.05 Compute Pr{ Y > 0 } = ???? Thank you!

9. ## Social Studies

which historical event was the most important in forming the character of modern Germany? A: industrial revolution B: protestant reformation C: WW2 D: enlightenment

10. ## Algebra

Since opening night, attendance at Play A has increased steadily, while attendance at Play B first rose and then fell. Equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. On what day(s)

11. ## Math

After a boulder is pushed down a hill, its speed s(t) at time t is given by the formula s(t)=v+at, where v is the initial velocity and a is the acceleration. If s(2)=16 and s(5)=25, find the initial velocity and acceleration.(round to the nearest tenth)

12. ## Math

A bag contains 6 red marbles, 3 white marbles, and 7 blue marbles. You pick a marble without looking. Find the probability of drawing a white marble. A. 3/7 B. 7/16 C. 3/16 D. 13/16 Please help please and thank you

13. ## Physics

A dragster's top acceleration is 60m/s^2. If it accelerates for 3 seconds from the starting line, how fast will it be going?

14. ## Modern World Studies

Hi! I just needed someone to check my answer on this question before I turned it in. Although they are considered an important part of Native American culture, there were no ____ in the Americas before Spanish explorers arrived. A: tomatoes (I pick this)

15. ## Math

With the current, a person can canoe 24 miles in 4 hours. Against the same current, the same person can canoe 18 miles in 6 hours. Find the person’s average rate in still water and the average rate of the current.

16. ## Math

A woman rows a boat 1.75 miles upstream against a constant current in 35 minutes. She then rows the same distance downstream (with the same current) in 15 minutes. What is the rate of the current?

17. ## Algebra

Which of the following methods can be used to construct a pattern of 10 numbers for which it would be mathematically impossible to predict the 11th term? (more then one answer.) A.Make a pattern, starting with 3, where each number is the next digit of pi

18. ## chemistry

A 31.5 ml aliquot of H2SO4 of an unknown concentration was titration with 0.0134 M NaOH. write the balanced chemical reaction with the correct states of matter.

19. ## Math

British sterling silver is a copper-silver alloy that is 7.5% copper by weight. How many grams of pure copper and how many grams of British sterling silver should be used to prepare 200 grams of a copper-silver alloy that is 10% copper by weight? (round to

20. ## Math

What is the difference between the height of the tallest man at 92.95" and the mean height of men at 69.6" and a stanard deviation of 2.8? How many standard deviations is that? Convert tallest man to a z score Does tall mans height meet the criterion of

21. ## Chemistry

In a redox reaction, explain why the oxidizing agent undergoes reduction?

22. ## statistics

What is the difference between the height of the tallest man at 92.95" and the mean height of me at 69.6" and a stanard deviation of 2.8? How many standard deviations is that? Convert tallest man to a z score Does tall mans height meet the criterion of

23. ## chemestry

a coin is composed of gold and silver. the 5.00g coin is dissolved in nitric acid and the solution treated with NaCl to precipitate out 2.35g of AgCl. Gold chlorides do not precipitate under the same conditions. What is the composition of silver (by mass)

24. ## Stats

Among 15,378 Delta airline passengers randomly selected, 3 were bumped from a flight against there wishes (based on data from the us dept of transportation) find the probability that a random selected passenger is involuntarily bumped. Is such bumping

25. ## physics

A loudspeaker diaphragm is vibrating in simple harmonic motion with a frequency of 430 Hz and a maximum displacement of 0.90 mm. what is the max speed? what is the max acceleration?

26. ## chemistry

Sulfuric acid reacts with hydrogen iodide to produce sulfur dioxide, iodine and water. a) write total ionic equation b)write net ionic equation

27. ## math

Two trains leave a station at 11:00am. One train travels north at a rate of 75 mph and another travels east at a rate of 60 mph. Assuming the trains do not stop, about how many minutes will it take for the trains to be 250 miles apart?

28. ## College Chemistry

The molar heat of reaction, H rxn, for the reaction of Ca(s) + 2H+(aq) Ca2+(aq) + H2(g) is -544.789 kJ/mol and Hrxn, for the reaction of CaO(s) + 2H+(aq) Ca2+(aq) + H2O(l) is -192.42 kJ/mol, the heat of formation of water is -286 kJ/mol, The H ffor CaO(s)

29. ## Math

The length of a rectangular pool is to be four times its width, and a sidewalk 6 feet wide will surround the pool. If a total area of 1440 𝑓𝑡 2 has been set aside for construction, what are the dimensions of the pool?

30. ## Math

A short airplane trip between two cities took 30 minutes when traveling with the wind. The return trip took 45 minutes when traveling against the wind. If the speed of the plane with no wind is 320 mph, find the speed of the wind and the distance between

A solenoid 20 cm long is constructed from 500 loops of wire and carries a current of 5 A as seen the diagram below. A tiny hole is drilled through the diameter of the solenoid in such a way that the current through the solenoid is not disrupted. If an

32. ## Algebra

The simple formula for the nth term of an arithmetic sequence is an = 4n + 16. What is the explicit formula corresponding to the simple formula?

33. ## tats

No(Did not lie) Yes(lied) positive test result 15(false positive) 42(true positive) negative test result 32(true negative) 9 (false negative) Refer to table and assume that one of the 98 test subjects is randomly selected. Find the probability of selecting

34. ## CALCULUS 2

Consider the solid S described below. A right circular cone with height 7h and base radius 2r Find the volume V of this solid

35. ## IPC

Dont understand ipc at all... As more resistors are added to a series circuit, the current ____ Increases Stays the same Decreases

36. ## World History

what are the most important events that happened in the genocide in rwanda?

37. ## Math

The base of a triangle is three inches more than its height. If each is increased by 3 inches the area of the triangle (1/2 bh) is 14 square inches. Find the original base (𝑏) and the original height (ℎ) in inches. (Lesson 15)

38. ## Math

Temperature readings on the Fahrenheit and Celsius scales are related by the formula 𝐶 = 5 9 (𝐹 − 32). Determine when the temperature reading on the Celsius scale is twice the temperature reading on the Fahrenheit scale.

39. ## Statistics

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study, 449 babies were born, and 250 of them were girls. Use the sample data with .01 significance level to test the claim that with this method, the

40. ## CALCULUS 2

Consider the solid obtained by rotating the region bounded by the given curves about the line x = 1. y = x, y = 0, x = 4, x = 6 Find the volume V of this solid

41. ## Social Studdies

How did magnetic compasses effect life in Europe?

42. ## Physics

A Green light wave is traveling a rate of 3*10^8 m/s and a wavelength of 561 m. How fast would a red wave with a wavelength of 447m travel?

43. ## chemestry

the mass of CuSCN precipitate is 1.379g, what is the mass of copper in the precipitate?

44. ## stats

group rh+ 39 35 8 4 rh- 6 5 2 1 People with blood type AB and rh+ are considered to be universal recipients. If three of the 100 subjects are selected find the probability they are all universal recipients.

45. ## Math

The base of a triangle is three inches more than its height. If each is increased by 3 inches the area of the triangle (1/2 bh) is 14 square inches. Find the original base (𝑏) and the original height (ℎ) in inches. (Lesson 15)

46. ## Math

A pharmacist is to prepare 30 milliliters of a solution with a drug concentration of 2 mg/mL. To do so, he will mix a solution with a drug concentration of 7 mg/mL with grape-flavored syrup. If 𝑥 represents the number of milliliters of grape-flavored

47. ## Math

You have 8 liters of a 60% alcohol solution. How many liters of water should be added to make a 35% alcohol solution?.

48. ## Biology

What would happen if you ran the same sample of DNA as your first experiment but used different primers?

49. ## physics

A yo-yo has a rotational inertia of 810 g·cm2 and a mass of 95 g. Its axle radius is 2.6 mm and its string is 100 cm long. The yo-yo is thrown so that its its initial speed down the string is 1.0 m/s. (a) How long does the yo-yo take to reach the end of

miguel line sup 5 cups of pop (labelled Cup 1, 2, 3, 4, 5 on a table. sandra then tastes each cup and records "D" if she thinks its diet pop or "R" if she thinks its regular pop. a. how many different ways can the Ds and Rs be recorded if sandra guesses

51. ## FIN

Brady Corporation is a leader in identification, safety, and material solutions. In 1998, the firm was hit hard by faltering foreign markets, so it embarked upon an aggressive campaign to redesign its cost structure. The firm believes this will help it to

52. ## Math

What percent of 25 is 10? 10 = p • 25; 40% 10 = p • 25; 250% 25 = p • 10; 40% 25 = p • 10; 250% Is it A or C? Help please! Thanks!!

53. ## Math

solve the exponential function for x using base 5 logarithms. 5^x+4=125^1-3x

54. ## Math

solve the exponential function for x by using common logarithms. 5^x=50^x+1

55. ## Math

Find all values of 𝑐, so that the solutions of the following equation are real numbers 2x2 − 4𝑥 + 𝑐 = 0

56. ## Differentials (calc)

Solve the Poisson equation ∇^2u = sin(πx) for 0 ≤ x ≤ 1and 0 ≤ y ≤ 1 with boundary conditions u(x, 0) = x for 0 ≤ x ≤ 1/2, u(x, 0) = 1 − x for 1/2 ≤ x ≤ 1 and 0 everywhere else. Hint: break this up as into two different PDEs.

57. ## Math

For a particular quadratic function f(x)=ax^2+bx+c, f(−3)=−13 and f(2)=7. If a=−3, find b and c.

58. ## physics

State the surface powers required to produce the following lenses with +6.25D front curves. a. -0.50 DS b. +0.50 DS c. +1.75 DS Is a -6.75DS?....

1. ## Math

I can't find a website that works though, everything is so confusing!

posted on March 21, 2019
2. ## Social Studies

yes, you are correct I do ask strangers for help when I have trouble with my questions AFTER reading my entire lesson. It just happens that you are one of those people. I have been thinking about how are one of the first people to answer anyone's

posted on May 3, 2018
3. ## Social Studies

you are no help

posted on May 3, 2018
4. ## Social Studies

I think its D

posted on May 3, 2018
5. ## Polynomials

I think it is either A or B

posted on May 25, 2016
6. ## Pre-Algrebra

I think that 3 is B... 4 I think is B... 6 is maybe A... 7 I think is B... 15 is maybe C... 18 is possibly C... 19 is maybe B... 20 is I think C... and 21 is possibly A? Any way.. I don't think that these are correct...

posted on May 25, 2016
7. ## Pre-Algrebra

posted on May 25, 2016
8. ## Pre-Algrebra

So... Can anyone help me with these problems?

posted on May 24, 2016
9. ## Pre-Algrebra

ok but I know how to do some of them but these are giving me a hard time.

posted on May 24, 2016
10. ## Pre-Algrebra

ok I guess but I really do need help with these! I truly do not wan to fail math!

posted on May 24, 2016
11. ## Pre-Algrebra

I could try but I am not good at these...

posted on May 24, 2016
12. ## Math!!!

That's equal to zero :) :) :) For this question I got .45 and it was automatically marked as wrong so I was frustrated! Thank you!

posted on January 6, 2016
13. ## Math

Thank you

posted on December 7, 2015

1.50(253) - 78(253) It should be \$182.16

posted on March 24, 2015
15. ## IPC

its an online coarse.. thanks.

posted on May 12, 2011
16. ## Chemistry

how would you find total number of moles?

posted on April 17, 2011
17. ## CALCULUS 2

It's calculus and it's in my homework.

posted on February 17, 2010
18. ## World History

Probably the beggining and why it started

posted on October 29, 2007