# Isaac

Most popular questions and responses by Isaac

Lance wants to find the total length of 3 boards. He uses the expression 3 1/2 + (2+ 4 1/2). How can Lance rewrite the expression using both the Associative and Commutative Properties of Addition?

2. ## Unit 6 lesson 6

1.Which ratios form a proportion A.3/15,12/55 B.8/24,12/35 C.5/18,25/90D.4/11,16/25 2.Which ratio forms a proportion with 9/15 A.6/10B.16/21C.36/50D.45/70

3. ## math

Explain how to write 3 x 3/8 as the product of a whole number and a unit fraction.

4. ## chemistry

10.5g of potassium trioxonitrate(v) salt saturated 5g of solvent at 15°c. Calculate the solubility of potassium trioxonitrate(v) salt at that same temperature in: a)g/100g of solvents b)moles per dm^-3

5. ## trig

two ships p and q left a port at the same time. q sailed on a bearing of 150 while p sailed on the north side of q. after a distance of 8km and 10km by pand q respectively, their distance apart was 12km. find the bearing of p and r

6. ## History

Why did the chisholm trail end in abilene, kansas? plz help i read the text it gave me and i still can't find the answer.

7. ## maths "polygon"

in a nonagon 6 of the angles are equal,the other three is 33 more than the 6 angles,find the angles here is my work 6x+3(33+6x)=1260 am getting a decimal answer plz help?

8. ## math

A study of a population of 1,200 frogs revealed that 12 out of every 180 frogs in the population have spots on their back. Based on the results of this study, how many frogs in the population do NOT have spots on their back? A 80 B 168 C 1,280 D 1,120**

9. ## English

African slaughter rituals should be allowed in the suburbs?

10. ## Calculus

Hello, could someone please help me with this problem? I'm a little stuck with it. Thanks, Isaac A rectangle is to be inscribed with its base on the x-axis and its other two vertices above the x-axis on the parabola y=9-x^2 (a) find the dimensions of the

11. ## basic technology

a man 80kg carries a load of bricks of mass 20kg up a vertical ladder of length 6m what work has he done

12. ## Chemistry

How much heat is produced by the complete reaction of 5.29 kg of nitromethane?

13. ## math

tap a was turned on to fill a rectangular tank of 50cm by 40cm by 28cm with water at a rate of 6 liters per minute. after 2 minutes, tap b was turned on to drain water from the tank at a rate of 2 liters per minutes. 6 minutes after tap b was turned on,

14. ## math

There are 10 girls and 6 boys in a class. The teacher randomly draws one student's name and then draws another. What is the probability that the first name drawn will be a boy and the second will be a girl?

15. ## math

I spent 2/3 of my money at store A. I spent 1/3 of my money at store B. When I left store B I had \$4. How much money did I have when I entered store A?

16. ## English

What is the predicate in this sentence? The wiskers on my kitten twitch when I rub its back.

17. ## Physics

The horizontal surface on which the block of mass 5 kg slides is frictionless. The force of 29 N acts on the block in a horizontal direction and the force of 58 N acts on the block at an angle(top Right). What is the magnitude of the resulting acceleration

18. ## science

A relative density bottle has a mass of 40g when empty, 90g when filled with water and 80g when filled with oil. Calculate the relative density of the oil.

19. ## Math

Explain how you could estimate 22% of 78 to check if your answer is reasonable.

20. ## Chemistry

determine the mass of carbon(IV)oxide,CO2,produced on burning104of ethyne,C2H2,(C=12,O=16,H=1)

21. ## chemistry

state four differences between acid-base indicators and universal indicators

22. ## chemistry

What volume of a 1.35 M solution contains 6.2mol of MgCl?

23. ## Science

A wheel rotate 200° in 4 seconds. calculate the angular turn in radius.

√4

25. ## math

A map with a scale of 1cm to 5km has an area of 405cmsquare.What is the actual area of the map on the ground

26. ## inorganic chemistry

silt is an example of ........ Hydride

27. ## Physics

Over a time interval of 2.15 years, the velocity of a planet orbiting a distant star reverses direction, changing from +18.9 km/s to -17.3 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s2) during

28. ## Science

How much graphite carbon must be burned in oxygen gas to produce 2.2 grams of carbon dioxide gas

29. ## Math

A=p+prt. Solve for p and t

30. ## maths

Rebecca need 10 1/2 yard to make a quilt of fabric that is 2 1/2 yards and another piece of fabric that is 4 1/4 yard how many more yard of fabric does Rebecca need to make the quilt

31. ## equations

decide whether each equation is true or false.For each true equation,write the number property shown by the equation.0+6=6

32. ## Trig

A ship leaves port at 6 am and heads due east at 20 knots. At 10 am, to avoid a storm the ship changes course to N 47° E.. (47° east of north). Find the ships distance from port at 4 pm.

33. ## science

On a warm summer afternoon, why would cumulus clouds and thunderstorms form in one part of a town and not in another? Usually such clouds are not in towns. They are in the upper atmosphere. Please read: http://en.wikipedia.org/wiki/Cumulus_cloud THEN TRY

34. ## Math

A plane flies 150km due south and then 150km on a bearing of 45 degrees Celsius. With repeat to it initial position, find a. How far south the plane is b. how far east the plane is is c. It bearing d. How far way it is

35. ## pioneer math

last year mr smith's rectangular garden has a width of 4 meters and an area of 24 square meters this year he wants to make it three times as long and twice as wide

36. ## physics

a particle a of mass 2kg and particle b of mass 1kg are connected by alight elastic string c, and initially held at rest 0.9m apart on a smooth horizontal table with the string in tension. they are then simultaneously released . the string releases 12j of

37. ## Physics

Find the magnitude of the displacement of a point on a wheel initially in contact with the ground when the wheel (of radius 36.2 cm) rolls forward half a revolution.

38. ## Chem 1

How can you prepare 2M of 200 ml HNO3 solution from 63% stock solution of HNO3 which has a density of 1.4 g/ml?

39. ## math

\$112 for 16 tickets, solve by determining the unit rate

40. ## physics, vector

three vector f1=2i-3j -4k, f2=3i+4j-0k,f3=3i-j+5k act on a body of mass 40g causing it to displace for 10sec from p1 ( 2,3,7 ) to p2 ( 3,6,7 ). (i) estimate the over all displacement vector. (ii) estimate the resultant force on the body . (iii) what is the

what does the statement "the properties of salts are different from the properties of the elements"mean.

42. ## Physics

A truck on a straight road starts from rest and accelerates at 2.8 m/s^2 until it reaches a speed of 16 m/s. Then the truck travels for 16s at constant speed until the brakes are applied,stopping the truck in a uniform manner in an additional 3.6 s. How

43. ## Algebra

A smart phone is on sale for 25% off its list price. The sale price is \$149.25. What expression can be used to represent the list price of the phone.

44. ## Physics

A hang glider and its pilot have a total mass equal to 120 kg. While executing a 360 degree turn, the glider moves in a circle with an 8-m radius. The gliders mass is 10 m/s. a) what is the net force on the hang glider? b) What is the acceleration?

45. ## math

Roger just got a puppy for his birthday. He and his mother will build a fence around an area in the backyard for the puppy to play in. The play area will be 24 square feet. What dimensions could the play area be? Which dimensions would require the least

Danielle received \$32 for her birthday. Three years ago, she received 1/4 as much. How much did Danielle receive three years ago?

47. ## mathematics

A sales manbought some plates at\$50.00 each.if he sold all of them for\$600.00 and made a profit of 20% on the transaction,how many plates did he buy

48. ## Calculus

A manufacturer constructs open boxes from sheets of cardboard that are 6 inches square by cutting small squares from the corners and folding up the sides. The Research and Development Department asks you to determine the size of the square that produces a

49. ## Physics

A 3 m, 250 N/m spring is at the bottom of a 10 m, 20 degree frictionless slope with a 30 m drop off the top of the incline. If a 10 kg wight is placed at the end of the spring when it is compressed 2 m, how fast will the block be traveling just before it

50. ## Calc 12

Let f be the function defined by f(x) = (x^2 + 1)e^-x for -4≤x≤4. a. For what value of x does f reach its absolute maximum? Justify your answer. b. Find the x-coordinates of all points of inflection of f. Justify your answer.

51. ## Physics

A body moving with a velocity at 10 ms collides with a stationery box of mass 100 kg.I f the body has a mass of 50 kg and the two move together after collision.Find their final velocity?

52. ## Ratio

Ratio in simplest form

53. ## mathematics

A sales manbought some plates at\$50.00 each.if he sold all of them for\$600.00 and made a profit of 20% on the transaction,how many plates did he buy?

54. ## mathematics

A sales manbought some plates at\$50.00 each.if he sold all of them for\$600.00 and made a profit of 20% on the transaction,how many plates did he buy?

55. ## Calculus

A manufacturer constructs open boxes from sheets of cardboard that are 6 inches square by cutting small squares from the corners and folding up the sides. The Research and Development Department asks you to determine the size of the square that produces a

56. ## newton

the sum of the first 12 terms of an AP is 168.if the third term is 7,find the value of common difference and first term

57. ## Science

Compare a desert ecosystem and forest ecosystem.

58. ## Physics

A body moving with a velocity at 10 ms collides with a stationery box of mass 100 kg.I f the body has a mass of 50 kg and the two move together after collision.Find their final velocity?

59. ## math

A square of lawn is surrounded by a path 0.5m wide,,the area of the lawn is 23m^2 bigger than that of the area of the path ,,find the side of the lawn

A sample of 900 items is taken from a population with standard deviation 15. The mean of the sample is 25. Test whether the sample has come from a population with mean 26.8. Take a=5%

61. ## Chemistry

Give an example of one polyatomic cation and one polyatomic anion. Show how these ions combine to make a compound. My thinking: Cation-ClO Anion-K How they form, I don't know?

62. ## Calculus

How can I prove this series alternating series converges(this is the answer)? (-1)^2*(2/3)^n I tried it this way: an = (2/3)^n, then i just broke it down. 2^n/(3^n) and i took the ratio of it and got 2/3 which does not equal to one which would mean the

63. ## math

At a lake, 40 people are water skiing or on the beach. Nine of the 12 people on the beach decide to swim. How many people are not on the beach?

64. ## Math

The temperature at the top of Mt. Washington one morning was -10 degrees Fahrenheit. With the conversion formula C=5/9(F-32). What was the temperature in degrees Celsius (to the nearest degree)?

65. ## trig

Find the exact solutions of the equation in the interval [0,2pi). sin(x/2)+cos(x)=0

67. ## Math

What is 25 Divided by (-5)

68. ## Math

What set of instructions would you give somebody to compare decimal numbers?

69. ## Math

How do you compare decimal numbers?

70. ## science

the radius of a CD is 0.06 m and it rotates at 3.5 rew/ s when playing music at the outer edge.find the maximum tangential speed of the disk.

71. ## Economics

discuss the concept of lemon problem and it effect on the efficient functioning of the financial market? Pls answer not more than 1000words

72. ## Math

How many positive integers less than 100 and divisible by 3 are also divisible by 4?

73. ## Math- Sequences and Series

Sn= N^2-4n, using this formula find the first 4 terms

74. ## Math

A watch loses five seconds every one hour How many minutes will it loss in two days

75. ## geography, math literacy, history and Business

Which career can I choose

76. ## Math

Elena jogs 7 kilometers west and then 5 kilometers down south. She stops and checks her time. How far is she from her starting point?

77. ## Math

What figure has six faces, and each face has the same surface area?

78. ## math

A square of lawn is surrounded by a path 0.5m wide,,the area of the lawn is 23m^2 bigger than that of the area of the path ,,find the side of the lawn.

79. ## Lusaka business and tecnical college

A uniform rod AB is 2m Long. The rod, which exerts a downward force of 60N at its center, is placed on a knife edge support positioned 0.8m from A. Determine the vertical downward force required at A to prevent rotation.

80. ## history

augustus ruled from__ to___. Where did he rule

The War of the Roses placed the __________ on the English throne. Lancasterists Tudors Sheffields Bosworths Normans

82. ## Physics Help!!!

A pitcher throws a 0.111-kg baseball, and it approaches the bat at a speed of 37.4 m/s. The bat does 78.6 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 30.8 m above the

83. ## chemistry

calculate the mass that if converted to energy would be equivalent to the energy released when 1g of CH4 is burned

84. ## economics

what is taxation

85. ## Linear Algebra

V = Mnxn is a space vector formed by all the square matrices. Is W = {A in Mnxn : A^x = A} a subspace of V? Thanks

86. ## math

The sum of 8 and y is less than or equal to −22 .

87. ## physics

Cylinder water tank 80cms height 1000liters what is its diameter

88. ## Chemistry

How Would You Classify The Oxides Of period3A Elemet?

89. ## Math

The width is 2/3x+10 and the height is 1/3x+5 and the next question asks if the perimeter was 90 what would x represent?

90. ## Chemistry Solutions

Commercial Sodium hydroxide has a concentration of 19.4mol/L. How many milliliters of sodium hydroxide solution can be prepared from 59g or sodium hydroxide.

91. ## Math

The Sum Of Two Consecutive Number Is 39.What Is The Smallest Number

92. ## Budini ss chem

Describe the preparation of sodium hydroxide in the school laboratory.

93. ## Math

Determin x if f(g(x))=0 for the following f(x) = 3x-2 g(x) =5x+5

94. ## Math

Several models of a rectangular cabin are being studied the perimeter of each model is 26 inches the length of one model is 8 inches what is the width of the model

95. ## Algebra

a car salesman works for a monthly wage of \$1000 and 10% of his cars sold. Using m for his total monthly income and c for the value of the cars he sells in a month, the equation that shows this is m=0.10c+1000 A. What would the equation be if, instead, he

96. ## Chemistry

When is the term, formula unit, useful? Is it when trying to figure out the empirical formula?

97. ## AP Calc

The curve y=x^3 intersects the line y=7x-6 at three points, (-3,-27), (1,1), and (2,8). Find the total area bounded by y=x^3 and y=7x-6.

98. ## AP Calc

The curve y=x^3 intersects the line y=7x-6 at three points, (-3,-27), (1,1), and (2,8). Find the total area bounded by y=x^3 and y=7x-6.

99. ## Physics B

A car, moving along a straight stretch of highway, begins to accelerate at 0.0261 m/s2. It takes the car 48.6 s to cover 1 km. How fast was the car going when it first began to accelerate? Answer in units of m/s Couldn't find a formula for this :(