# melvin

Most popular questions and responses by melvin
1. ## Statistics

The amount of time the university professors devote to their jobs per week is normally dis- tributed with a mean of 52 hours and a standard deviation of 8 hours. (a) What is the probability that a professor works for more than 56 hours per week? (b) Find

2. ## math

A ladder 9.00 m long leans against the side of a building. If the ladder is inclined at an angle of 75.0° to the horizontal, what is the horizontal distance from the bottom of the ladder to the building?

3. ## organic.chem

Compound X, C8H17Cl, is a chiral product of the radical chlorination of 4-methylheptane. X reacts in SN2 fashion with NaI in acetone to form Z, C8H17I. When the reactant is the R-enantiomer of X, only the R-enantiomer of Z is formed. What is the structural

4. ## Physical Science

A model electric train requires 12 V to operate. When connected to a household voltage of 120 V, a transformer is needed. If the primary coil has 500 turns, how many turns must the secondary coil have?

5. ## math

the angle of elevation of the top of a radio mast from a point 53m from its base on level ground is 61degre. Find the height of the mast to the nearest 5m.

6. ## Algebra

A 12 - ft ladder leans against the side of a house. The bottom of the ladder is 6 ft from the side of the house. How high is the top of the ladder from the ground? If necessary, round your answer to the nearest tenth.

7. ## Algebra

The formula T=2π√L/480 can be used to find the period (T in seconds, the time it takes a pendulum to complete one cycle) of a pendulum that is L cm long. (a)Rewrite this formula using rational exponents. Don't forget to rationalize the denominator.

8. ## math

How much water must be added to 60 liters of 60 percent alcohol mixture to reduce it to a mixture of 50 percent alcohol concentration? What if 30 percent alcohol mixture is added instead of water?

9. ## Math

The vector a1=(1,1,0) and a2=(1,1,1) span plane in R^3. Find the projection matrix P onto the plane, and find nonzero vector b that is projected to zero.

10. ## science

An incident Ray makes 60 degrees angle with the surface of the plane mirror, what is the angle of refraction. Options are...a 60 b 90 c 30 d 0....this is a question in a guide is it correct

11. ## AP Physics

Light passes from air into water at an angle of incidence of 33.5.degrees Find the angle of refraction in the water. Answer in units of degrees

12. ## math

The ratio of boys to girls on the bus is 20/15

13. ## algebra

a bug crawls clockwise around the outside rim of a clock from 12 to 4 and travels 7 inches. if a second bug crawls around the outside rim from 6 to 11, in the same direction, how many inches did the bug crawl?

14. ## analytic

what is the answer of this?the line segment connecting (x,6)and (9,y) is bisected by the point (7,3) find the values of x and y

15. ## Statictics

What is the probability of tossing a number divisible by two, and the probability of tossing a prime number of a "Fair Die"?

17. ## algebra

A perfume maker wishes to blend perfume valued at \$ 410 an ounce with perfume worth \$ 250 an ounce to obtain a mixture of 40 ounce worth \$ 300 an ounce. How much of the \$ 410 perfume should he use?

18. ## math

List the ages of two people in your life, one older than you and one younger than you. It would be best if the younger person was 15 years of age or younger. Find the prime factorizations of your age and the other two persons’ ages. Show your work listed

19. ## algebra

How do you solve 1/125=25^6x-5 please and thank you I read this as 1/125 = 256x-5 or 5-3=256x-5 Take the log base five of each side.. -3=2(6x-5) solve for x. What exactly do you mean by take the log base five of each side?

20. ## algebra

admission tickets to an advanced movie screening were priced at P 200 for adult and P 150 for students. If 450 tickets were sold and the total receipts were P 14, 400. How many of each type of tickets were sold?

21. ## logic

Convert the following formula to conjunctive normal form (clause form). a) a ≡ (b ≡ c) is the answer (a כ(( b כ c) ^ (c כ b))) ^ ((( b כ c) ^ (c כ b)) כ a) unsure thanks

22. ## Principles of finance

Faulkner’s Fine Fries Inc (FFF) is thinking about reducing its debt burden. Given the following capital structure information and an expected EBIT of \$50 Million (plus or minus 10%) next year, should FFF change their capital structure? FAULKNER'S FINE

23. ## Statistics

This is my first stats class and I don't know how to do this, could you please help me? Thank you. You are asked to determine the typical number of sales of a certain product at the store you work for. A sample of 50 days over the last quarter shows an

24. ## math

Adding mixed numbers so its the same denominator: 3 5/8 + 12 1/6

25. ## Math

I am 55, my motherlaw is 70, my friend is 40. How do I figure out the LCM and the GCF. My home assignment is listed as= List the ages of two people in your life, one older than you and one younger than you. It would be best if the younger person was 15

26. ## Math

Admission tickets to an advanced movie screening were priced at \$ 200 for adults and \$ 150 for students. If 450 tickets were sold and the total receipts were \$ 14, 400. How many of each type of tickets were sold?

27. ## algebra

A can do certain task in 8 hours, B in 10 hours and C in 12 hours. How long will it take to do the task if A and B work 1 hour and then A and C finish the task?

28. ## algebra

How much water must be added to 60 liters of 60 percent alcohol mixture to reduce it to a mixture of 50 percent alcohol concentration? What if 30 percent alcohol mixture is added instead of water?

29. ## health

An example of a depression screening tool includes the ? A. Patient health Questionnaire B. Center for Epidemiologic Studies Depression scale C. Geriatric Depression Scale D. All od the above

30. ## Math

if a 6 foot man casts an 8 foot shadow what is the height of the building that casts a 72 foot shadow

31. ## statistics

The general manager for Gordon's Self Service Gasoline is interested in estimating the mean number of gallons of gasoline that are purchased by customers at their Philadelphia location. He would like his estimate to be within plus or minus 0.50 gallons,

32. ## math

help! If you have an equilateral triangle with a line down the middle from top to bottom with T at the top and R X S at the bottom, X being in the middle and RT=6, RS=9 then RX= what?

33. ## Public Finance

A worker lives in a state that has its own income tax. The worker is in the 31 percent federal tax bracket. In addition, he is subject to a 9 percent MTR for his state income tax. Assume that mortgage interest is deductible both on his federal and state

34. ## english

Hi. I know this might be kind of a stupid question, but I was wondering if a predecessor follows something or is before it? I thought it was after, but the dictionary definition makes it seem like it is before. Is it before because of the pre? Thank you

35. ## algebra

Pablo and Linda both travelled from Tuguegarao to Manila for a convention. Pablo drove his car at an average speed of 50 km per hour, while Linda took a plane. Her trip required 1 hour, and his 9 hours. What was the average speed of Linda's plane?

36. ## math

a group of 3 friends shared the cost of a tape recorder. if andy, barbara, and donna each paid \$12, \$30 and \$18, respectively, then donna paid what percent of the cost of the tape recorder?

37. ## Science

A car of mass m travelling at 20 m/s east on a straight level road and a truck of mass 2m travelling at 20 m/s west on the same road. What is the velocity of the car relative to the truck?

38. ## math

employees worked 200 regular hours and 50 hours of overtime. what percent of the total hours for the week were overtime?

39. ## Math

show that the length of Ax equals the length of A^T x if AA^T=A^T A

40. ## PHYSICS

A steam turbine operates between hot and cold reservoir temperatures of 538.0 ¢XC and 92.1 ¢XC, respectively. If heat is supplied at a rate of 238.0 MW, what maximum amount of power could the turbine deliver?

41. ## history

Without our two great political parties cutting across economic and geographic interests.Democracy as we know it could never have been made to function. The author of this statement probably meant to suggest that

42. ## algebra

A man can do a certain task in 21 hours, another man can do the task in 28 hours and a boy can do the task in 48 hours. Find how long it will take to do the task if all three work.

43. ## algebra

jake and jessie are standing next to each other in the sun. if jake's shadow is 48 inches long, and he is 72 inches tall, how long is jessie's shadow, in inches, if she is 66 inches tall?

44. ## algebra

An equivalent expression of h+zx

45. ## prepositional calculus

Convert the following formula to conjunctive normal form (clause form). a) a ≡ (b ≡ c) is the answer (a כ(( b כ c) ^ (c כ b))) ^ ((( b כ c) ^ (c כ b)) כ a) unsure thanks

46. ## writing

Compare and contrast your abilities as an academic writer now as opposed to when you began your studies at the University of Phoenix. Using four comparatives and four superlatives within your responses, explain what has led to these changes and what

47. ## science

Whose responsibility is it to reduce our impacts on climate?

48. ## history

What do the Stars on the U.S. Flag mean.

1. ## Taylor

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posted on September 24, 2019
2. ## Taylor

98fw8f90t9t9t9t9y969fhfcuud

posted on September 24, 2019
3. ## algebra

noted

posted on December 4, 2017
4. ## Math

Man 1/21 other man 1/28 boy 1/48 Man’s rate other man’s rate boy’s rate 1/21 1/28 1/48 Let x be the number of hours it will take all three to do the task. Combined rate = 1/x 1/21 + 1/28 + 1/48 = LCD = 28, 224 1344 / 28, 224 + 1008 / 28, 224 + 588 /

posted on December 4, 2017
5. ## Math

Miscellaneous Problem 4.) The three angles of a triangle are x , ( x+30), (x-6) The sum of the angle of a triangle is 180. x + (x + 30) + (x-6) = 180 x + x + 30 + x – 6 = 180 3x + 30 – 6 = 180 3x + 24 = 180 3x = 180 – 24 3x = 156 x = 52 degree (x +

posted on December 4, 2017
6. ## math

45km : 30liters = ?km : 45liters (45)(45) = 2025 2025/30 = 67.5km

posted on December 3, 2017
7. ## BOB

30

posted on April 6, 2017
8. ## Government

Amy is right guys i took OCA's answers and got an 80... Listen to amy... wel 5 is actually A for me but i think the schools are doing that on purpose for this exact reason Haha

posted on February 1, 2017
9. ## prepositional calculus

my problem has nothing to do with assigning truth values though I have to rewrite it in conductive normal form

posted on January 19, 2016
10. ## prepositional calculus

you did not misunderstand the ≡ operator

posted on January 19, 2016
11. ## algebra

\$27.00

posted on February 17, 2015
12. ## math

what is the ratio from girl to boy and the bus is 20/15

posted on November 25, 2014
13. ## math

how did you get four? I followed you up till 4.9. What did you divide in order to get 4?

posted on November 18, 2014
14. ## Chemistry

no not unless the teacher says your not allowed too

posted on September 25, 2011
15. ## Algebra

Thanks Henry and bobpursley for replying. Now the question makes sense :-)

posted on June 11, 2011
16. ## math

I am 55 years old (Melvin) and I am supposed to list the ages of two people in your life which is my mother in law(Saraha) whom is 70 years old is the one older than me and one younger than me is my friend (Peter), he is 40 years old. I am supposed to find

posted on January 25, 2011
17. ## organic.chem

Since you can't draw the structures, could you just give me the name of X and I will draw the structure.Thanks!

posted on June 22, 2009
18. ## social studies

all the countriies we studied in this chapter gained independence from the soviet union

posted on November 10, 2008