Thursday

December 18, 2014

December 18, 2014

Total # Posts: 457

**Physics**

What is the vector product of A=2i + 3j + 1k and B=1i - 3j - 2k?
*November 23, 2014*

**Math**

There are 25 plants in arts garden. There are four times as many tomato plants as bean plants. How many tomato and bean plants are there?
*November 13, 2014*

**Physics**

A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy 1.80x10^-21J. What angle ...
*November 12, 2014*

**Physics**

A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy 1.80x10^-21J. What angle ...
*November 12, 2014*

**Math**

Katie measures that 6 1/2 pieces of model plane parts were five in one fifth inches long how long is each piece
*November 10, 2014*

**physics**

A neutron with a mass of 1.67x10^-27 kg traveling east with a kinetic energy of 2.00x10^-21J collides perfectly elastically with helium nucleus with a mass 6.68x10^-27 kg that is initially at rest. After the collision, the neutron has a kinetic energy 1.80x10^-21J. What angle ...
*November 9, 2014*

**Math **

Groups in math class have 4 green marbles, 6 yellow marbles, and 10 black marbles. Each group pulls out a marble, records it, and then replaces it 50 times. The class complies its data. how many times can you expect to pull out a green marble with 1000 pulls?
*November 6, 2014*

**Math Calc**

Given a right triangle ABC with a=13 and b=26, find the value of angle A, angle B, and side length c. Round to the nearest thousandth.
*November 2, 2014*

**HELP! - Physics**

I need help with this. A frustrated farmer is trying to move a large rock from his land. The stone has a mass of 1275 kg. By using a piece of board as a lever and a fulcrum the farmer will have a better chance of moving the rock. The farmer places the fulcrum 0.288 m from the ...
*October 28, 2014*

**Calculus**

167.5516
*October 19, 2014*

**physics**

Two people jump out of an airplane. They hold on to each other while falling straight down at a shared terminal speed of 60.7 m/s. Suddenly, they push away from each other. Immediately after separation, the first skydiver (who has a mass of 89.3 kg) has the following velocity ...
*October 9, 2014*

**physics**

An astronaut comes loose while outside the spacecraft and finds himself floating away from the spacecraft with only a big bag of tools. In desperation, the astronaut throws his bag of tools in the direction of his motion (away from the space station). The astronaut has a mass ...
*October 9, 2014*

**Physics **

A crate sets on wooden horizontal surface (a wooden floor). The figure shows a top view of this looking down onto the crate (gravity would be acting into the page). Man one and man two apply forces F1 and F2, at angles of θ1 and θ2 respectively, with the goal of ...
*October 9, 2014*

**physics**

I am struggling with this. A wombat of mass 22.0 kg starting at rest slides 13.0 m down a tree at a speed of 5.80 m/s just before reaching the bottom. (a) What is the change in the gravitational potential energy of the wombat during the trip? (b) What is the wombat’s ...
*October 2, 2014*

**physics**

We do not know the mass of block. The angle of the ramp going down is 44.3 degrees and after it goes across the horizontal surface, it goes up a second ramp at 24.5 degrees
*October 2, 2014*

**physics**

I am having great difficulty with this question. A block is placed on a frictionless ramp at a height of 12.5 m above the ground. Starting from rest, the block slides down the ramp. At the bottom of the ramp, the block slides onto a frictionless horizontal track without ...
*October 2, 2014*

**psych 42 **

The mean (μ) of the scale is 55 and the standard deviation (σ) is 7. Assuming that the scores are normally distributed, what PERCENTAGE of the population scores are above 59?
*September 21, 2014*

**Analytic Geometry**

Find the vertices, foci, eccentricity and length of the latus rectum of the ellipse whose equation is x^2 + 9Y^2 = 9
*September 17, 2014*

**language arts**

So is contention an wisdom the answer?
*September 16, 2014*

**math**

5. There are x dictionaries in a bookstore. After 1/8 of them were purchased, 10 more dictionaries were shipped in bringing the total number of dictionaries to 52. What is the value of x?
*July 28, 2014*

**math**

If n>0, then (4^n)(8^n)= A.2^9n B.2^8n C.2^6n D.2^5n E.2^4n
*July 28, 2014*

**math**

Jim can fill a pool carrying buckets of water in 30 minutes. Sue can do the same job in 45 minutes. Tony can do the same job in 1.5 hours. How quickly can all three fill the pool together? A.12 minutes B.15 minutes C.21 minutes D.23 minutes E.28 minutes I got 53 minutes, but ...
*July 28, 2014*

**math**

6. In a residential building, the ratio of man and woman is 5 to 8. In August, there are 30 men and 10 women moving out from the building. After that, the ratio of man and woman in this building is 1 to 2. How many men were there in the building before August 1? please show work.
*July 28, 2014*

**math**

If 12V=3W, and v(not equal)=0, then which of the following is equivalent to 2W-8V? A.0 B.4W C.-6W D.2V E.-2V please show work.
*July 28, 2014*

**math**

How many three-dight integers greater than 600 contain only odd digits?
*July 28, 2014*

**math**

2. James spends 10% of his money for movie; he also spends 20% of his money for his lunch. Then he buys $20 in his office supplies. In the next day, he spends $10 for his breakfast. Now he leaves 40% of his original money. How much does he save originally? please show work.
*July 28, 2014*

**math**

Mr. Brown sold a jacket for $240, this making a profit of 20% on his cost. Later, he sold another jacket for $240 this time suffering a loss of 20% on his cost. The result of the two sales was A.He gained $40.00 B.He gained $10.00 C.He lost $20.00 D.He lost $10.00 E.He gained...
*July 26, 2014*

**math **

2.If the largest of 7 consecutive integers is 25 what is the average of the 7 integers? A.24 B.22 C.21 D.20 E.16 I got E, this is my work: 7x+21/7=25 7x+21=175 -21 -21 7x=154 x=22
*July 24, 2014*

**math**

Janelle has $20 and is saving $6 per week. April has $150 and is spending $4 per week. When will they both have have the same amount of money? please show work,
*July 24, 2014*

**math**

6. If each of eight biology classrooms is in use for 5 hours and 15 minutes per day, and total of 84 student experiments are done, how long does each experiment take on average? A.20 minutes B.30 minutes C. 40 minutes D.50 minutes E.1 hour please show work.
*July 23, 2014*

**math**

A company wants to send out a mailer. A mailer be sent only if it has an envelope and a stamp. For the number of mailers printed, the company has only 1/2 the number of envelopes needed. Of those mailers for which there are envelopes, the company has only 1/3 the number of ...
*July 23, 2014*

**math**

9.If 1/4 the recommended daily requirement of vitamin P is 2 ounces, what is the total recommended daily requirement of vitamin P? please show work.
*July 23, 2014*

**math**

Ex 12: The smallest of five consecutive integers is represent by y-3. What is the largest of these integers, in terms of y? please explain and show work.
*July 22, 2014*

**math**

15. The sum of five unequal whole numbers is 90. The second largest of these five numbers can be at most A.19 B.41 C.43 D.89 please explain and show work.
*July 21, 2014*

**math**

Rico works for a landscaping company. He will enclose a square garden, using a full 50 ft roll of wire fencing. What could the largest dimension of the garden be? Sketch and label the garden, then calculate perimeter to verify your answer.
*July 19, 2014*

**math**

5. The sum of 7 unequal positive integers is 61. What is the largest possible value that any of those integers can have? A.55 B.40 C.39 D.13 E.9 please show work
*July 19, 2014*

**math**

One package of water plants is recommended for 3000 cubic centimeters of water in a fish tank. How many packages of plants will be needed for a 45cm by 70cm tank that is filled to a depth of 10cm? please show work.
*July 17, 2014*

**math**

Rosa is working on rectangular fish tank that is 15 cm wide and 20 cm long. How much tape will she need to put all around the top of the tank? please show work
*July 17, 2014*

**math**

What number, when has "4" as exponent and increases by 4, is equal to the product 26 and 10?
*July 16, 2014*

**math**

Bob's age is now 3 times of Tom's age. Twelve years from now, tom will be 15 years old. How old is Bob now? please explain and show work
*July 16, 2014*

**math**

If length of one side of a 3x3 square is four times, and the length of the adjacent side is tripled, the perimeter of the new rectangle is how many times bigger than the perimeter of the original square? please explain and show work.
*July 16, 2014*

**math**

One phone plan charges a $20 monthly fee and $0.08 per minute on every phone call made. Another phone plan charges a $12 monthly fee and $0.12 per minute on each call. After how many minutes is the charge the same for both plans? A.60 minutes B.90 minutes C.120 minutes D.200 ...
*July 14, 2014*

**math**

Fred earns $56 a week. 0.0613 of his pay is taken out for Social Security. To the nearest cent how much is taken out each week?
*July 12, 2014*

**math**

5.Escape velocity is the speed necessary to escape the gravitational pull of a plant. The escape velocity of Earth is 11.3 kilometers per second, while the escape velocity of Saturn is 310% of that. What is the escape velocity of Saturn?
*July 8, 2014*

**math**

7500
*July 8, 2014*

**math**

3.Students at one school sell magazine subscriptions to raise money for athletic equipment. The school keeps 20% of sales. How many dollars worth of subscriptions must be sold to make $1500?
*July 8, 2014*

**math**

A ship model is 0.5% actual size. If the model is 1 meter long, what is the actual length of the ship?
*July 8, 2014*

**math**

It equals 45.
*July 3, 2014*

**math**

8. Of the 180 students who took part in the Race for Hunger, about 5/8 were sophomores. Of the sophomores, 40% were girls. How many sophomore girls took part in the race? A.35 girls B.125 girls C.45 girls D.72 girls please explain and show work
*July 3, 2014*

**math**

The surface area of a cube with edge 2 is how many times the surface area of a cube with edge square root 2. A.square root 2 B.2 C.4 D.4 square root 2 E.8 please explain and show work.
*July 2, 2014*

**math**

6. A magician plays a game using a full deck of cards. This includes 4 each of aces, numbers 2-10, jacks,queens, and kings. What is the probability that an even numbered card will not be selected? please explain and show work.
*July 2, 2014*

**math**

Paul multiplied the sum of three and a number by three. This result was equal to fifty four plus twelve times the opposite of the number. What was his number? please explain and show work.
*July 2, 2014*

**math**

You worried about math last year for 300,000 minutes. this year you will worry about math for only 60 minutes.What percent decrease in minutes of math worry will you experience this year? please explain and show work.
*July 1, 2014*

**algebra**

How would I write this sentence as an equation in two variables? The-value is 5 more than 3 times the x-value
*June 22, 2014*

**algebra**

When 20% of a number is added to the number, the result is 60. Which one is the correct answer? ( 10, 50, 17, 120 )
*June 22, 2014*

**algebra**

When 4 times a number is added to 7 times the number, the result is 33. which one is correct? ( -4.7, 1, -3, 4.7 )
*June 22, 2014*

**algebra**

When 4 times a number is subtracted from 7 times the number, the result is 30. which one is correct? {3, -15, 10, or 0.9
*June 22, 2014*

**algebra**

Solving the linear equation -2x-2+7(x+1)=2x
*June 22, 2014*

**algebra**

I already picked the wrong answer. I am trying to get the correct multiple choice answer for this question
*June 22, 2014*

**algebra**

The y-value is 5 more than 3 times the x-value. Which answer? 1. y=3x+5 2. y=-3x+5 3. y=-3x-5 4. y=3x-5
*June 22, 2014*

**algebra**

1.-2X-2 +7(x+1)=2x 2. 9x-1=-5+8x 3.7x-3= 4. when 4 times a number is subtracted from 7 times the number, the result is 30. What is the number? 5. when 4 times a number is added to 7 times the number, the result is 33. What is the number? 6. When 20% of a number is added to the...
*June 22, 2014*

**algebra**

solve for linear equation: -2x-2+7(x+1)=2x
*June 22, 2014*

**algebra**

In this equation or question: translate the following text into an equation involving ratios and solve it. " Anne is paid $45 per hour, if she worked 55 hours in a particular week, how much will she be paid that week? 45/1 = x/55: cross multiply and solve for x. 45(x)= ...
*June 22, 2014*

**Math**

How are addition and multiplication used to solve a linear equation? Demonstrate by solving " 15x+7=31+3x
*June 19, 2014*

**Math**

Translate the following text into an equation involving ratios and solve it. " Anne is paid $45 per hour, if she works 55 hours in a particular week, how much will she be paid that week?
*June 19, 2014*

**Math**

Yes, maybe an example
*June 16, 2014*

**Math**

Evaluate the algebraic expression: 6x+2= 3x-4= 9x+6=
*June 16, 2014*

**math**

When four times the number is added to 7 times the number, the result is 33, what is the number?
*June 15, 2014*

**math**

The distance between points A and B is 10 units. If a has coordinates (4,-6) and B has coordinates (-2,y), determine the value of y. Please show work and explain. A.-6 B.-2 C.0 D.1 E.2 This is what I got so far: 10= square root of (4-(-2))^2+(-6-(y))^2
*May 30, 2014*

**maths**

If 5 1/2 yards = 1 rod and 3 feet = 1 yard,how many rods are equivalent to 1 foot? 1. 2/11 2. 6/11 3. 2/33 4. 11/6 5. 11/2 6. 11/8
*May 23, 2014*

**maths**

A box of 12 table costs 21 cents.The same brand is packaged in bottles containing 100 tablets and sells for $1.50 per bottle.How much is saved per dozen, by purchasing the larger amount? 1. 1/4 cents 2. 1 cents 3. 1/2 cents 4. 1 3/4 cents 5. 3 cents 6. 6 cents
*May 23, 2014*

**Math**

If x<y, z=x/2 and a=y/2, then please show work/ explain A.z<a B.a>z C.a=z D.2a>y E.2x>2z
*May 14, 2014*

**math**

5.If inequalities are multiplied by positive number, the order remains the same. If x>y and z>0, then xz>yz. However, if inequalities are multiplied by negative numbers the order is reversed. If x>y and z<0 then xz<yz Please show work and explain.
*May 13, 2014*

**math**

If unequal quantities are subtracted from equal quantities, the remainders are unequal in the opposite order. Since 25=25 and 5>3, then 20<22. If x=y and a>d, then x-a<y-d. Please show work and explain.
*May 13, 2014*

**math**

The average of P numbers is x and the average of N numbers is y. What is the average of all the (P+N)numbers? a. x+y/2 b. x+y c. Py+Nx/xy(P+N) d. x+y/P+N e. Px+Ny/P+N
*May 10, 2014*

**math**

If a and b are both positive numbers,and a>b,which of the following could be true? I. ab is greater than either a or b. II. ab is greater than b but less than a. III. ab is less than either a or b. (A) I only (B) II only (C) III only (D) I and II only (E) I,II,and III
*May 10, 2014*

**math**

The enrollment in a university is now 52,500, an increase of 5% over the enrollment last year.By how many students did the enrollment increase this year? a. 2500 b. 47,500 c. 50,000 d. 55,000 e. 57,750 f. 60,000
*May 9, 2014*

**math**

If the operation # is defined by the equation x # y = 2x + y,what is the value of a in the equation 2 # a = a # 3 ? a. 0 b. -1 c. 1 d. 1.5 e.-1.5 f. 2
*May 9, 2014*

**Math**

25. A metal cube with an edge of one foot is melted into rectangular solid one-eighth of a foot in height. What is the area of the top of the top of the new solid. Please show work/explain A. 1/64 sq.ft. B. 1/8 sq.ft. C. 1/4 sq.ft. D. 4 sq.ft. E. 8 sq.ft.
*May 8, 2014*

**Math**

36. A clock gains 20 minutes each day. if the correct time is indicated now , in how many days will it again show the first correct time? Please show work/explain A.8 B.18 C.20 D.36 E.72
*May 8, 2014*

**Math**

The distance s in feet that a body falls in t seconds is given by the formula s=16t^2. If a body has been falling for 5 seconds, how far will it fall during the 6th second? Please show work/explain A. 16 ft. B. 80 ft. C. 176 ft. D. 400 ft. E. 576 ft.
*May 8, 2014*

**Math**

o is the center of the regular pentagon ABCDE. How many degrees are there in OAB? Please explain or show work A.36 B.54 C.72 D.108 E.126
*May 8, 2014*

**physics**

12.8 kg of ice at 0 C is dropped into 3.3 kg of water at C. What fraction of the ice melts? =
*May 4, 2014*

**Math**

X=66 2/3%Y Y=33 1/3%Z Z=(?)%X Please show work. A.16 2/3 B.22 2/9 C.45 D.300 E.450
*April 19, 2014*

**Math**

The value of 12 is obtained by multiplying p% by A.12 B.12/p C.p/12 D.1200/p E.100p/12 Is there any work for this?, if so please show work.
*April 19, 2014*

**Math**

pg.3 18.Which, if any of the following statements is always true? A. If the numerator and the denominator of a fraction are increased or decreased, by the same amount, the value of the fraction is unchanged. B. If the numerator and the denominator of a fraction are squared, ...
*April 19, 2014*

**Math**

z+1/z=2; z=? (1/z is a fraction) Please show work. I got C.1 as my answer. A.Square root of 3 B.1/2 C.1 D.1 1/2 E.2
*April 18, 2014*

**physics**

Two wires are anchored at both ends. Wire 1 has a mass of 105 grams and a length of 6.9 m. Wire 2 has a mass of 60 grams, a length of 20 m, and a tension of 143 N. What must be the tension in Wire 1 if its third harmonic is to equal the first overtone of Wire 2? T_{wire1} =
*April 14, 2014*

**Chemistry**

Which nucleophile, when reacted with 1-bromopropane (CH3CH2CH2Br), would produce a thiol? OH- SH- I- -OCH3
*March 26, 2014*

**chemistry**

Which nucleophile, when reacted with 1-bromopropane (CH3CH2CH2Br), would produce an ether? I- OH- -OCH3 SH-
*March 26, 2014*

**Chem**

A 7.00 mL sample of blood serum has a pH of 7.38 a. What is the concentration of H3O+? b. What is the concentration of OH-? c. How many moles of H3O+ are present? I have no clue what to do and I don't have a calculator with me someone help me I would really appreciate it.
*March 19, 2014*

**physics**

A construction worker riding in the tray of a truck traveling at 10 m/s, sees one of his friends passing and decides to jump off the truck. The magnitude of his initial speed of jumping is: (a) zero (b) Less than the truck's (c) Equal to that of the truck (d) Greater than ...
*March 9, 2014*

**poem**

Thanks
*March 5, 2014*

**poem**

so can the fourth line be: and went for the sewer
*March 5, 2014*

**poem**

then can the fourth one be: and became boor
*March 5, 2014*

**poem**

can i start the third line like this?: When he got poor fourth line: and went for a call. line 5: And the sun turned sunny.
*March 5, 2014*

**poem**

Title:The dawn it comes There once was a boy named John whose never saw the dawn. When the sun went down and went to the pond. And saw what was dim. Is this a good poem? This is a limerick, lines 1,2,and 5 must rhyme.Lines 3 and 4 must rhyme. Please help if can.
*March 5, 2014*

**chem **

Mercury(II) Oxide decomposes upon heating, producing elemental mercury. This reaction has an enthalpy value of 90.8 kJ/mol. How much heat is required to produce 2000 lbs of mercury?
*February 26, 2014*

**chemistry**

which of the following tetrahedral molecules is polar? please explain CH4 CF4 CH3F thanks
*February 25, 2014*

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