# Derrick

Popular questions and responses by Derrick
1. ## algebra

The distance, d, between two points, (x1,y1) and (x2,y2), can be found using the formula d=√(x2−x1)^2+(y2−y1)^2 How can you rearrange the given formula to correctly find y2?

2. ## Trig

I need help setting these up. 1.) Use the parallelogram rule to find the magnitude of the resultant force for the two forces shown in the figure. round to one decimal place. Theta= 35 degree, b=98 lbs, c=55lb 2.) Find the magnitude and direction angle for

3. ## chemistry

Which of the following are redox reactions? (a) Ba(NO3)2 (aq) + H2SO4 (aq) -> BaSO4 (s) + 2 HNO3 (aq) (b) NH4NO2 (s) -> N2 (g) + 2 H2O (g) (c) CuO (s) + H2 (g) -> Cu (s) + H2O (L)

4. ## Programming

Write the pseudocode for a program to calculate the wages of a sales according to the following rules. The wage is calculated at a rate of 15% of sales. If the salesman has been with the company more than three years, he receives a loyalty bonus of 10% of

5. ## science

What is the approximate charge difference between glutamic acid and acetic acid at pH 9.5?

6. ## Social Studies

40 North latitude and 160 west longitude Pacific Oceann? 23 North latitude 5 East longitude Sahara Desert? 10 South latitude and 76 west longitude Peru? 40 North latitude 135 East longitude sea of japan? 80 north latitude 140 west longitude artic ocean?

7. ## Chemistry

This question is very confusing, I do not understand what it wants me to do. Each reaction below has been identified by type. Use this information to help predict products. Copy and then complete each equation by writing the products of the reactions.

8. ## maths

Two vertical poles, 3m and 7m long are on the same straight line with a point P on the ground. The shorter pole is 20m from P and the longer pole. The angle of elevation of the top T of the longer pole from the top R of the shorter one is 30degree,

9. ## Chemistry

Which of the four factors affecting reaction rate is most important in each example below? Choose from among concentration, temperature, surface area, and catalyst. A? Extra dish soap is added to help cut the grease when washing a frying pan. =

10. ## Chemistry

Complete and balance the following neutralization reactions. then, write the names of all the reactants and all the products in each chemical reaction. A) HNO3 + Al(OH)3 = 3HNO3 + Al(OH)3 -> Al(NO3)3 + 3H2O Reactants: Nitric acid, Aluminum hydroxide

11. ## Physics

In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." The radius of the room is 4.0 m, The coefficient of static friction is μ=0.13. What is the minimum rotation frequency such that the people will not slide down the wall

12. ## Physics

Superman, who likes physics, dangles his watch from a thin piece of string while he is taking off from ground horizontally at a constant acceleration a. He notices that the string makes an angle of θ with respect to the vertical. After 18 seconds, his

13. ## Math

A rental car agency charges \$50 plus .25 cents per mile to rent a car. How many miles can you drive for \$400? How many miles can you drive for \$300

14. ## chemistry

What is the pH of an aqueous solution of a weakly acidic drug that is 40% dissociated and has a pKa =4.7?

15. ## Social Studies

The Surpreme Court ruled that slaves were not citizens of the U.S. and had no rights. Answer:Dred Scott decision The number of slave states and free states was kept balanced when Missouri was allowed into the Untion as a slave state and Maine as a free

16. ## calculus

For what values of a and b that make the function f continuous everywhere. f(x)={(x^2-4)/(x-2) if x

17. ## Chemistry

List the total number of each type of atoms in the following reactants. A) 2HCL + Ca(OH)2 = 6 hydrogen, 2 carbon, 2 lithium, 2 calsium, 4 oxygen B) 2Na3PO3 + 3Ca(NO3)2 This one is a bit more complicated. May any chemistry teacher show me how to do this.

18. ## Chemistry

Draw a bohr diagram of the protons and electrons in each of the following: The ionic compounds lithium fluoride, LIF, and beryllium chloride, Becl2. Do I draw these 2 compounds separately, and I'm unsure of how.

19. ## Physics

What is the "Percent Difference Formula for Momentum"?

20. ## Phsyics

A model rocket is launched at an angle of 80 degrees aboce the x axis, with a velocity of 30m/s. How high will the rocket be 5 seconds after launch? ROund your answer to the nearest tenth

21. ## Dwamena Akenten SHS

A pole 25m long is placed against a vertical wall such that its lower end is 7m from the foot of the wall on the same horizontal ground. If the upper end of the pole is push down by 2m, calculate correct to 2 significant figure: 1) how much further away

22. ## Physics

A 0.4kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.3 m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 65 N, what is the maximum rpm(revolution per minute) the ball can

23. ## physics

An image on the screen of a 12 cm long pinhole camera is 7cm. How large is the original object, if it is located 36 cm in front of the pinhole?

24. ## Science

Which is the closest to the speed of sound in air? A. 7miles per hour B. 70miles per hour C. 700miles per hour D. 7000miles per hour C?

25. ## Science

How does a periscope work when it has 2 mirrors and light? A.Lenses refract the light B.Light bends as it travels and mirrors bend the light more C.Light travels in a straight line and the mirrors reflect the light D.Lenses and mirrors reflect the light

26. ## Science Help

How does a periscope work when it has 2 mirrors and light? A.Lenses refract the light B.Light bends as it travels and mirrors bend the light more C.Light travels in a straight line and the mirrors reflect the light D.Lenses and mirrors reflect the light

27. ## Chemistry

Draw a Bohr diagram of the protons and electrons in each of the following. a) an atom of magnesium Do I draw this with 19 atoms surrounding the shell of Magnesium around?

28. ## Chemistry

Name and give the symbol for each of the following: a)the element in period 3 group 2 = Magnesium = Mg b)the halogen in period 4 = Bromine = Br c)the element in period 6 and group 11 = Gold = Au d)the akali metal in period 2 = Lithium = Li e)the noble gas

29. ## math

Find the area of the shaded part in the figure. Use 3.14 for ƒàƒnand round your answer to one decimal place. the triangle as a cicle in the middle the right side is 15ft and the bottom side is 15ft what is the answer

30. ## art

Which men was an outspoken critic in regards to the perceived tyranny of church and state?

31. ## art

Which of the following men was an outspoken critic in regards to the perceived tyranny of church and state?

32. ## Chemistry

Explain why a mixture of zinc oxide and magnesium reacts when heated while there is no reaction when a mixture of zinc and magnesium oxide is heated

33. ## Physics

A car mass 800kg starts from rest and accelerates at 1.2m/s^2 .determine the final velocity attained by the car

34. ## Math

A man buys a car at 25 gh cedis.he pays 20% of the cost of his own resources and takes a loan for the remainder at 2.5% simple interest per annum.calculate the total amount the man pays for the car if he pays the loan 8 years later.

35. ## Chemistry

How many liters of HCl acid needed to dissolve at 1 ton of carbon and how long would it take?

36. ## Chemistry

Zinc - .5 grams HCl- .2 moles Find the Mass of ZnCl2 [How would you solve this?]

37. ## Chemistry

I have the mass of one element and the moles of a compound, How do I find the mass of it'd Product? [Zn + 2HCl = ZnCl2 + H2] (Slove for mass of ZnCl2)

38. ## math

At noon the teamperature was 50° F. It rose by 2° evrwy hour after that

39. ## Science

if a 1 kg mass is placed on top of the input piston what is the largest mass that the output piston

40. ## Chem - Oxidation States

Determine the oxidation states of Se and S in the products and reactants of the following equation. Amongst the reactants, which species would be called the oxidant and which would be called the reductant? 0.5 SeO4^2- (aq) + 0.125 H2S (aq) = 0.5 SeO3^2-

41. ## algebra

The length of a rectangle is four times its width. If the area of the rectangle is 392 yd, find the perimeter

42. ## algebra

a candy store sells gummy flies for \$5.25 per pound and Dew Drops for \$6.50 per pound. If they sell 4 times as many pounds of dew drops as gummy flies and take in \$906.25, how many pounds of dew drops did they sell?

43. ## Ethics and Moral Reasonong

In what way would Hill’s notion of “self-acceptance” correspond to Aristotle’s conception of eudaimonia? (Points : 1)

44. ## Buddo. Chemistry

when excess dilute sulphuric acid was added to coppper II oxide

45. ## Physics

How much work is done in lifting a 6kg object from the ground to a height of 4m? A 12n object is lifted 5m how much work is done How much work is done if a 5n object is lifted from the ground to a height of 8m? How much gravitational potential energy does

46. ## Physics/electricity

In the Bohr model of the hydrogen atom, an electron in the 2nd excited state moves at a speed of 5.48X10^5 m/s in a circular path having a radius of 2.12X10^-10 m. What is the effective current associated with this orbiting electron?

47. ## Math

Factorization

Algedra

49. ## Physics

A 10 m platform diver during his diving can increase his rotation rate from an initial rate of 0.8 rev/s to a maximum of 3.3 rev/s. If his initial moment of inertia was 10 kg·m2, what is his moment of inertia at his maximum rotation rate?

50. ## Math

Suppose the modified quota is 7.47. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower

51. ## Math

Suppose the modified quota is 7.47. Fill in the blanks, and round your answers to two decimal places. (a) Find the lower quota. (b) Find the upper quota. (c) Find the arithmetic mean of the lower and upper quotas. (d) Find the geometric mean of the lower

52. ## math

how do you know when you have found all the factors of a numbers?

53. ## Science

If a mineral is 10g, how much oxygen is in the mineral.

54. ## biochemistry

What is the approximate charge difference between glutamic acid and acetic acid at pH 9.5?

55. ## Math

What is the value of the expression below? (3+2)x5-6(6/2) A.10 B.22 C.12 D.20 B?

56. ## Math

What is the value of the expression 7(3x18-10) A.53 B.168 C.186 D.308 D?

57. ## Math

Which choice gives the correct order of operations needed to find the value of 4(6+3)-24 A.+,x,- B.x,+,- C.-,x,+ D.+,-,x A?

58. ## Order of Operations

Which choice gives the correct order of operations needed to find the value of 4(6+3)-24? A.+,x,= B.x,+,- C.-,x,+ D.+,-,x A? What is the value of the expression 7(3x18-10)? A.53 B.168 C.186 D.308 D? Simplify 4(3+2)+2(16/4) A,88 B,44 C,32 D,28 A? Simplify

59. ## Order of Operations

What does 8+6(7-4)/9 equal? is it 6

60. ## Order of Operations

Which choice gives the correct order of operations needed to find the value of the expression below? 6+7(5-2)/3 A.+,-,x,/ B.-,x,+,/ C.-,x,/,+ D./,x,-,+

61. ## Social Studies

23 degrees north latitude 90 degrees west longitude Gulf of mexico?

62. ## Social Studies

What is 22 degrees south latitude and 43 degrees west longitude? Rio de Janeino?

63. ## Social Studies

What is located on 60 north latitude and 85 west longitude?

64. ## Social Studies

What is located on 80 north latitude and 140 west longitude?

65. ## math

Find a point P on curve y = x^3 such that the slope of the line passing through point P & (1,1) is 3/4.

66. ## physics

100 lumen of light are incident on an interface which has 25% reflectance. At a point 3cm into the new medium, the amount of transmitted light is measured as 50 lumen. What is the absorptance of the material per cm?

67. ## biochemistry

The degree of dissociation, alpha, of an acid, HA, is defined by the relationship: alpha= [(A-)/[(A-)+ (HA)]. Calculate the degree of dissociation for acetic acid (pK=4.76) at 0.1 M

68. ## chemistry

write the structural formula for the dipeptide formed when the carboxyl end of cysteine bonds to the amino end of valine

69. ## math

5 cards are drawn at random from a standard deck of playing cards. What is the probability that all are the same suit?

70. ## chemistry

2 questions please: The highest positive oxidation number that chlorine can exhibit an any compound is +7, whereas its most negative oxidation number is -1. Write the electron configuration of chlorine and explain why these are limiting oxidation numbers

71. ## Chemistry

Pure water is added to 25.0 mL of a 1.00 M HCL solution. The new solution has a volume of 2.00 L. What is the pH of the new solution.

72. ## critical thinking

Homework Help: critical thinking Posted by long on Thursday, March 8, 2012 at 1:53pm. Read the scenario. Using the information provided in the references and lesson, arrive with your best possible solution. You are a squad leader in Sapper platoon, Special

73. ## History

The first transcontinental road in the United States ran from New York City to where?

74. ## History

What event in the U.S. History took place at Appomattox Court House in Virginia?

75. ## Math

Robert and his dad want to build a sandbox for his sister's birthday.They wanted it to be 4 feet wide and have an area of 28 square feet. What is the length of the sandbox? 7? Robert's dad decided to make the sandbox bigger by extending the length and

76. ## Math

Robert and his dad want to build a sandbox for his sister's birthday.They wanted it to be 4 feet wide and have an area of 28 square feet. What is the length of the sandbox? 7? Robert's dad decided to make the sandbox bigger by extending the length and

77. ## Science

1.What is refraction? The bending of light as it passes through matter 2.What type of lens would you use to magnify your view of a butterfly? Concave 3.What is a sound wave? Sound waves are waves of energy moving through matter.Sound waves are vibrations

78. ## Math

The table shows the number of lemons needed to make different numbers of pitchers of lemonade 24lemons 3pitchers 32lemons 4pitchers 56lemons 7 pitchers 96lemons 12pitchers What is the relationship between the number of pitchers and the number of lemons?

79. ## Math

Norton has cycled 15 miles and has drunk 7 liters of water. Which is the most reasonable prediction of the number of liters of water he will drink by the time he has cycled 50 miles? A.17 B.23 C.31 D.65 C?

80. ## Math

Allison's 11th birthday is just around the corner. Her parents are remodeling her bedroom for her birthday. They will replace her carpet and repaint her walls Allison's Room Height 8ft Width 11ft Length 13ft 1.Allison wants the top 1/2 of her walls painted

81. ## Math

Max's pencil was 8/23ft and Ian's pencil was 6/12. How much loner is Max's pencil than Ian's? A.2/12 B.4/12 C.6/12 D.14/12 Is it A or C?

82. ## Math

The table shows the times a train left Austin and arrived in San Antonio on 5 nights last week. Mon 6:30pm left 7:22pm arrived Tues 6:18pm left 7:10pm arrived Wed 6:45pm left 7:37pm arrived Thu 7:05pm left 7:57pm arrived Fri 6:28pm left 7:20pm arrived What

83. ## Math

Mrs. Garcia's class is making a banner to hang in the school's display case. They started by sewing 7/8 of a yard of gold fabric at the top, 5/8 of a yard of black fabric in the center, and 7/8 of a yard of red fabric on the bottom of the banner. How many

84. ## Math

Carlos counted all of the tickets that were taken at a school carnival. Each time he counted 10 tickets, he placed a tally on the chart below. Adult 16 Child 18 Which number sentence could be used to find t, the total number of tickets he counted?

85. ## Civics

Which is not a subunit of the Department of Health and Human Services?

86. ## math

The perimeter of a rectangular field is 560m.The length of the field is an eigth third of this distance.Find the length of the field.Find the width of the field

87. ## Programming

Write the pseudocode for a program to calculate the wages of a sales according to the following rules. The wage is calculated at a rate of 15% of sales. If the salesman has been with the company more than three years, he receives a loyalty bonus of 10% of

88. ## english

hi i really need some assitinance please help. The sentences in each word group below are coherent because they are linked by repetition of the same word, by synonyms, and by pronouns. Type the words that tie the sentences together in each group. Though he

89. ## science

What is the topography , climate and resources of mount vernon, new york 10550

90. ## science

How far away from the earth does acceleration due to gravity become 1% of its value at the earth's surface. Assume that the earth is a sphere of radius 638000000cm.

91. ## history

list and summarize the provisions of the 2 laws passed by the radical republicans to reduce the presidential power

92. ## Physics

A 3kg block is resting on a table with a coefficient of friction of 0.4. It is now pushed with a force of 15n. What is the acceleration of the book?

93. ## History

who was alleys with Britain during the war of 1812?

94. ## Chemistry

What is needed for nuclear fusion to occur? pressure, a beta particle or high temperature? I think it's only high temperature and pressure needed.

95. ## Chemistry

What is used to tell different isotopes of a particular element apart? A. the mass number B. the atomic number C. the number of protons D. the number of electrons A is the answer. After how many half-lives are there equal amounts of parent and daughter

96. ## DrBob222

These are the other equations I've balanced. I need help with one. AgNO3 + K2Cr2O7 --> double replacement AgNO3 + K2Cr2O7 --> AgCr2O7 + K2NO3 Please tell me if I've balanced these right. Br2 + NiI3 --> single replacement, element is a non-metal Br2 + NiI3

97. ## DrBob222

DrBob222 I am kind of stuck with the balancing stuff, and I already had send the post, did you not read it?

98. ## Chemistry

Recognize each of the following reactions as synthesis, decomposition, single replacement, double replacement, neutralization, or combustion. A)H3PO4 + 3NaOH -> Na3PO4 + 3H20 This reaction is known as Neutralization. B)P4 + 5O2 -> P4O10 This reaction is

99. ## Chemistry/ Dr.Bob222

DrBob222 I am beginning to understand about balancing equations well, thanks to your help, but there are still some other things, which I am having a hard time figuring out. Complete and balance the following chemical reactions between an acid and a metal.