# Davis

Popular questions and responses by Davis
1. ## Chem

Bromine has two natural occurring isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu. The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%. Calculate the mass and natural abundance of Br-79.

2. ## Chemistry

Samples of three different compounds were analyzed and the masses of each element were determined. Compound Mass Mass N(g) O(g) A 5.6 3.2 B 3.5 8.0 C 1.4 4.0 If you were John Dalton and had never heard of a mole, which of the following would you think were

3. ## Physics

A firefighter with a mass of 52 kg slides down a vertical pole with an acceleration of 3 m/s/s . The acceleration of gravity is 10 m/s/s. What is the friction force that is acting on him

4. ## math

A chocolate cookie recipe that makes 24 cookies uses 3/4 cups of brown sugar. If John wants to make 72 cookies, how much brown sugar does he need?

5. ## Chem!!!:/

Calculate the ratio of NaF to HF required to creAte a buffer with pH=4.00.

6. ## basic chem

1)an atom has a mass number of 27 and 14 neutrons. what is the atomic number of this atom? 2)The atomic number of fluorine is 9. What is the mass # of a fluorine atom with 8 neutrons?

7. ## Chemistry II

How long would it take for 1.50mols of water at 100.0deg C to be converted completely into steam if heat were added at a constant rate of 16.0j/s

8. ## math

The ã61 (square root of 61) is between what two whole numbers?I am a little bit losed when coming up with the answer can I trouble you for some help.

9. ## maths

two angles of a triangle are m° and (m+20)°.their sum is greater than the third angle.find the range value of m

10. ## math

a movng company wants to buy a new type of truck and needs to know the volume of the storage compartent before they can decide if they should purchase the truck. What is the volume of the storage compartment? 10ft, 18ft, 8ft, 2ft, 15ft.

11. ## Math algebr

Desire which property is illustrated by the given statement Which property is illustrated by the equation 3/7 (-17) = - 17 ( 3/7) A. Commutative property of multiplication B. Associative property of addition C. Distributive property D. Associative property

12. ## math

Simplify 4 to the 7th over 5 squared all raised to the 3rd power. 4 to the 10th over 5 to the 5th 4 to the 4th over 5 4 to the 21st over 5 to the 6th 12 to the 7th over 15 squared

13. ## chemistry

How many grams of NaCl should be added to 250 grams of water to make a 0.40 m solution? I got 19 grams. this is how I got it. first I found the mass of water = 18g then I converted that to mols 18/250 = .0072. I subtracted 0.072 - 0.40 = 0.328 I found the

14. ## IT/Proj Mgmt

Innovative Systems is ready to get started using the PMI standard. BPP is advising IS on a new project bid. The project involves setting up an automated tracking system for a library. Radio frequency (RF) tags would be attached to each book, and a

15. ## trig

Use trigonometric identities to find sec theta, given that tan theta = Radical 5/ 3.

16. ## math

I am having problems coming up with the answer to this problem. Could you kindly help me. It took Amanda 3 hours and 20 minutes to drive from her home to a friend’s house. She then drove to the beach which took her 4 hours and 25 minutes. It only took

17. ## math

Sally's \$1,800 savings is in two accounts. One account earns 6% annual interest and the other earns 3%. Her total interest for the year is \$93. How much does she have in each account?

18. ## math

Find the median of the following set of numbers. 45, 21, 55, 22, 65, 61

19. ## Trig

Find the angle of the measure formed by the clock. 2:15

20. ## trig

Suppose that 0degrees

21. ## math

find the median and mean of this numbers 95,75,86,96,70,68,76,81,95,76,69,83,93,88,94 Is the median 83and the mean 83 if i arrange the numbers in ascending order

22. ## math

(-6)^2-4^2 How wouLD I WORK THIS PROBLEM OUT

23. ## HCA/220

◦Scenario 2: You are an allied health professional working with an orthopedist. You have been working with the patient and need to update the doctor on the reason for the patient’s visit. Begin describing the patient’s concerns. Your classmates may

Match the psychological theories with the appropriate statement(s): Psychodynamic Theory Trait Theory Learning Theory Sociocultural Humanistic Theory Popular theorist Eysenck initiated the five-factor model. The healthy personality is found in balancing

25. ## AP Chemistry

Calculate the pH of a 75.0 ml solution containing 0.85 M lactic acid after the addition of 0.0225 moles NaL (assume a negligible volume change.)

26. ## Math

If you have a line intersecting at (3,6). What equation would represent both lines?

27. ## chemistry

calculate the molar concentration of 0.1 " AgNO3

28. ## trig

Suppose that 0degrees

29. ## trig

Use the appropriate identity to find tan(theta) given that cot theta =0.05.

30. ## english

John gave Samuel his hockey stick. In this sentence, Samuel is the ____.

How would I set up this problem to solve it: Gene offers 30 mins. and 60 mins. driving lessons. He gave 8 lessons that lasted 7 hours. How many 60 minute lessons did he give?

32. ## math

can I trouble any one with this que stion. I got jello brain right now. 7-(-1)/3(2)-9/(-3)

33. ## math

(-8)2 – 8(2 )= I need help with this problem i have wrecked my brain and havnt came up with the answer

34. ## math

how would you use the concepts from chapter 8 in real life situation? Decribe how these concepts might be useful

35. ## Math

you lave a line intersecting at (3,6) what would represent the two lines?

36. ## Government

I think it is ( C ) but not sure, can someone verify correct answer Which part of Congress was designed to be more responsive to the citizens? A) Senate B) House C) Both Senate and House D) Neither Senate nor House

37. ## PRECALCULUS

solve: tantheta = sintheta

38. ## trig

5sin^2 270degrees -3cos180degrees-tan(-180degrees) i got -2 but I'm not sure if i did it right?

39. ## english

What is the compound subject of the following? Tamara and Janet served soup and salad at the luncheon.

40. ## english

What is the subject of the following sentence? Please help me figure this out! a. Please b. help c. me d. You (implied)

41. ## english

Identify the indirect object in the following sentence: Fernando read Miguel a bedtime story.

42. ## math

Can any one help me with this problem am having trouble with coming up with the answer. 7-(-1)/3(2)-9/(-3)

43. ## math

11. Place the following set of numbers in ascending order. 20, –7, 5, –5, 12, 4, 15

(-9)(5)/-3

45. ## math

How would you use the concepts from Chapter 8 in a real-life situation?

46. ## math

. Which pair of fractions is proportional?0.8/0.4=3.2/2.4 or 0.8/0.4=4/2.4 or 0.8/0.4=3.2/2.4 or 0.8/0.4=4/2.4

47. ## math

Carol has 22% of her pay withheld for deductions. If she earns \$680 per week, what amount is withheld?

48. ## HCA/220

◦Scenario 3: You have just started your career as a physical therapist and have been assigned to a mentor. Begin a discussion with your mentor that mentions specifically how you have helped your patients improve their mobility and aided in their

49. ## Gov

Can state elections go into runoff?

50. ## english

Research skills are primarily valued for which of the following reasons

51. ## english

Which of the following sentences contains an error? A) The student's attitude did not help her succeed. B) How many students are you planning to hire? C) Student's need to work hard if they want to receive good grades. D) Students' votes are important in

-2-6

53. ## math

Can some one please help me I had developed jello brain today. Can some one explain to me why the line x = - 2 is avertical line. and what the slope would be for the line. and why its diffenrence for y = -2 . what would the slope be for y = -2. Please I am

54. ## math

4-(-3)+1/2-2/(-2)

55. ## math

16?(-2)+(-4)/2^3+4 How would i work out this problem to get to the soultion

56. ## HCA/220

Scenario 1: You are attending a wellness conference and one of the exhibitors is a chiropractor in your local area. You are unfamiliar with chiropractic care and want to learn more. Since you are at the conference, the doctor assumes that you have

57. ## Physics

A spring with a spring constant k=450.0 N/m is attached to a mass of m=8 kg and stretched -0.5 m from its equilibrium position and released. What is the speed of the block when it is at the equilibrium position?

58. ## physics

what is nature of a graph of period against angle

59. ## english

Which of the following pronouns shows possession? they - them - her - its

(-4)(5)=

61. ## math

I need to see if i worked this problem right. -8 - -7 =-15 -8+-7=-15 do i add this together aredo i subtract and get -1

62. ## math

- 2.3 – (- 8.9) does it equal -6.6 or x= 2/3=4/6=6/9 x=8/9-6/9=2/9

-1/2-(-5/8)

-3.4-(-7.6)

-9--4

66. ## math

What is the population of Europe in 2000? (b) What is the total area of Europe?

67. ## math

Carol has 22% of her pay withheld for deductions. If she earns \$680 per week, what amount is withheld?

68. ## Government

Need help What is the difference between a member of the President’s cabinet and a czar? A)There is no difference. B)Czars are confirmed by the Senate but not cabinet members. C)The President appoints cabinet members but Congress appoints czars. D) Both

69. ## math

2+3x+4 input x=3 and output y=6

70. ## math

Find the five-number summary of the following set of numbers: 349, 243, 119, 363, 246, 505, 263, 221, 324

(-6)2 (-4)2

72. ## math

soltion for -3( -6)+(4)(-2)

73. ## math

1/3+(-5/6)+-1/2=

74. ## math

3/7-6/7,1/7,-1/2,2/7

75. ## math

help! what ia 1/4(sin4x)? just to jump start this proof

1. ## french language

posted on June 7, 2019
2. ## math

I SWEAR THIS TEACHER OR WHOEVER IS SOOOOO COMPLICATED. JUST GIVE HIM THE ANSWER. AINT NOBODY GOT TIME FO THAT.

posted on June 8, 2018

Corrected the question from earlier If you have a line intersecting at (3,6). what equation would represent both lines?

posted on February 8, 2017

What is the equation for this problem

posted on February 8, 2017
5. ## Chemistry

=1/2 [0.2x2x1*2 + 0.2x1x(-2)*2] =1/2 [0.4 + 0.8] =1/2 [1.2] = 0.6

posted on August 6, 2016
6. ## Science

Connections here!

posted on April 20, 2016
7. ## Government

posted on November 19, 2015
8. ## Government

so is the correct answer ( D )

posted on November 19, 2015
9. ## health

people need to reread the question on the test they have because the answers may not be in the same order

posted on September 24, 2015
10. ## Chemistry

posted on June 30, 2013
11. ## math

there are 4 cows and 8 ducks

posted on March 25, 2013
12. ## AP Chemistry

Thanks Dr. Bob!

posted on April 9, 2012
13. ## AP Chemistry

How do I figure out the Pka value?

posted on April 9, 2012
14. ## AP Chemistry

DrBob--How do I determine the Pka value?

posted on April 9, 2012
15. ## psychology

1.Who came up with the psychosexual stages? *Sigmund Freud Skinner Gardner Lada Gaga 2.Which psychologist tested classical conditioning with dogs? B. F. Skinner *Ivan Pavlov Igor Pavlov Sigmund Freud 3. Explain the difference between operant conditioning

posted on February 6, 2012
16. ## SCIENCE!!!!!!!!!!!!!!111111

A unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.

posted on August 29, 2011
17. ## algebra

I believe you get .0030864. solve what's in the parenthesis first then ^2. turn fractions into decimal format then add them and ^2.

posted on August 29, 2011
18. ## Algebra

As time passes, the ticket sales get higher. Each time you plug in different values of X, the day tickets go on sale, your Y value increases.

posted on August 29, 2011
19. ## Algebra

For D)..... Your parabola should be negative because of the -2X^2. SO the parabola when you graph it is a backwards U. The middle of the backwards "U" has a high maximum so your tickets should be at a peak during the middle of the sale.

posted on August 29, 2011
20. ## math

third one is true

posted on August 29, 2011
21. ## science

1meter=1X10^-9 nanometers 1meter=1X10^-6 micrometers 1meter=1X10^-10 Angstrom 1meter=1X10^6 MegaMeter

posted on August 29, 2011
22. ## chemistry

Use the Molarity Formula Molarity= moles/liters of solution Molarity= moles/0.050 Liters To find moles you have to find the moles of each sample of KBr. SO 1.00M KBR times .025liters =.025moles And then 0.800M KBR times .075liters=.060moles. Then you add

posted on August 29, 2011
23. ## Chem

oh okay i get it now, thank you! Why did you subtract 1.00 from the abundance though? how do you know?

posted on August 28, 2011
24. ## Chem

(79.904)=(80.9163)(0.4931) + x(0.4931) 79.904=39.90 + 0.4931x 40.004=0.4931x x=81.13amu

posted on August 28, 2011