Thursday
December 18, 2014

Posts by johnny


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
ok
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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