# Posts by Thomas

Total # Posts: 743

Math
What is the area of a triangle 4.5,4, and 3.

Math
In Mike's English class at university there are 178 students, of whom 51 also study history and 44 also study statistics. There are another 85 students who also study history, of whom 25 study statistics also. Another 35 students study only statistics. If 15 students study...

Maths
There are more than 15, I know that for sure.

Maths
There are 6 dots, because it is a 2x3 square.

Maths
How many squares in the plane have two or more vertices on dots in this 2x3 grid? All dots are an equal distance from their nearest neighbours. *diagonal squares count* -------------------------------------- I can only get 18, but some of my class members can get at least 30.

Math
Following the recent? census, State? A, with a population of 13.5 ?million, was allocated 23 representatives. State? B, with a population of 12.4 ?million, was given 16 representatives. Assume one more representative is to be assigned to one of these states. How do I solve ...

Politics
Why would theorists and policymakers from different regions potentially approach IPE differently from one another? Any thoughts? It is said that Marxism is very common in developing countries. In the developed world, we are seeing the protectionism approach becoming more ...

Math
A test has 12 problems, and each problem is worth 5 marks. Full marks are given for a correct answer, 2 marks are given if there is no answer, and no marks are given for an incorrect answer. Some scores between 1 and 60, are impossible to get on this test. What is the sum of ...

Math
The Indianapolis 500 race was shortened by 415 mi. If the averaged mph was 151.774 what was the time to the nearest thousandth

Math
When wrapping a birthday gift in the shape of a rectangular prism for his mother, Kenji adds an additional 2.5 square feet of gift wrap to allow for overlap.How many square feet of gift wrap will Kenji use to wrap a gift 3.5 feet long, 18 inches wide, and 2 feet high? In this ...

Math
Ms.Sue can you help me please ma'am?I'm stuck.

Math
In Alaska Mt.McKinley is 890 meters taller than Mt. Foraker and 1198 meters taller then Mt. Blackburn is 4996 meters. What is the height of Mt. Foraker?

Math
I already saw this post and he didn't help with part IV with different letters. That's the part I'm having trouble on...

Math
There are 52 white keys on a piano. The lowest key is A. The keys are designated A, B, C, D, E, F, and G in succession, and then the sequence of letters repeats, ending with a C for the highest key. a) If five notes are played simultaneously, in how many ways could the notes ...

Math 253 algebra
Ann takes 2 hours to wash her car. When her sister helps her, the job takes 5/4 hours. How long does it take Ann's sister to wash the car by herself. ( Note:I created a table and gave ann a 1/2 fraction and her sister a x/1 fraction but got lost from their.)

Science

Maths
One of the formulas to find the area of a triangle is a = r*s. Where the r is the radius of the circle inscribed the triangle, and s being the semi perimeter. (s = p/2) Prove that the same formula works for a square.

Math
IF the LCM of two numbers a and b is 40, what is the LCM of 7a^2 and 7b^2?

physics
When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 869 N and the drag force has a magnitude of 1096 N. ...

physics
Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The mass of the man is 84 kg, and the mass of the woman is 49 kg. The woman pushes on the man with a force of 58 N due east. Determine ...

physics
In a quarter-mile drag race, two cars start simultaneously from rest, and each accelerates at a constant rate until it either reaches its maximum speed or crosses the finish line. Car A has an acceleration of 11.0 m/s2 and a maximum speed of 110 m/s. Car B has an acceleration ...

math
Only two forces act on an object (mass=3.19 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object.

physics
An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +7.62 x 105 m/s to a final velocity of 2.56 x 106 m/s while traveling a distance of ...

College Physics
Two forces  and  are applied to an object whose mass is 5.75 kg. The larger force is . When both forces point due east, the object's acceleration has a magnitude of 0.979 m/s2. However, when  points due east and &...

math
Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 7.9-kg projectile from rest to a speed of 2.8 × 103 m/s. The net force accelerating the projectile is 6.7...

History
Peoples diets in Europe consisted mainly of bland bread and potatoes.

math
A person in a kayak starts paddling, and it accelerates from 0 to 0.614 m/s in a distance of 0.372 m. If the combined mass of the person and the kayak is 61.0 kg, what is the magnitude of the net force acting on the kayak?

Math
In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 46.6 m/s in a time of 6.82 s. The mass of the car and riders is 6.72 × 103 kg. Find the average net force exerted on ...

RATIOS AND RATES
At a local grocery store, Sabrina spends \$3.96 for 2 pounds of blueberries. How much can she expect to pay for 6 pounds of blueberries?

math
Given that the roots of the equation 3x^2+x+2=0 are a and b, show that 27a^4=11a+10.

Physics
what metal is it if, it is 7.14g/mL => Cast Iron.

Calculus applications
6. The bending moment (M) along a beam is M = WLx/2 -Wx2/2 kNm where x is the distance of a beam length L from the left hand end. W is the weight per unit length. (a) Shear force is calculated as the differential of bending moment. Find an expression for shear force and ...

history knowledge
I just want to know this for fun because I saw it and one of my history books and want to learn about it. Why did Alexander the Greats empire fall?

Calculus applications
A steel factory wishes to make a cylindrical container, of thin metal, to hold 100cm³, using the least possible area of metal. If the outside surface is S cm² and the radius is r cm, show that S = 2?r² + 200r-1 and hence find the required radius and height for ...

Algebra

Physics
A typical candy bar contains 300 kilo-calories of energy. if all the energy released by eating the candy bar could be used to do work in lifting a 1000 kg car, how high could it be lifted?

brain drain
pets e.g dogs

math
Tom used 5/8 yard of ribbon to tie weights on the tail of his kite. He cut the length of ribbon in equal pieces that were 1/12 yard long. How many pieces, each 1/12 yard long did Tom cut from the 5/8 yard ribbon?

Math
Three-dimensional tic-tac-toe can be played on three arrays of 3x3 lattice points. To win, three points in a line must be chosen. Examples of such lines are ABC, ADE, AFG, AHI, FHJ. How many different lines can be found?

Public speaking
B. Clapping

Public speaking
Nonverbal communication includes A.posture B.clapping C.eye contact D.all of the above

physics
which ball has more energy a 5 kg ball rolling at 4 m/s or a 6 kg ball rolling at 3 m/s?

math
i) P(X < 6200) P(Z < 6200-6300/400) P(Z < - 0.25) = 0.4013 The probably of sales being less than 6200L is 40.13% ii) Question is not complete, so I cannot answer it.

Math
Distance = Square Root ((x2-x1)^2 +(y2-y1)^2) Square Root ((2-(-1))^2 + (4-0)^2) Square Root ((2+1)^2 + (4)^2 Square Root ((3)^2 + 16) Square Root (9+16) Square Root (25) = 5

Math
All students in Peter's class have \$1.05, consisting of nickels and/or dimes and/or quarters. Each student has a different combination of coins, and all possible combinations of coins are included. What is the probability that Peter is unable to give his friend Jenny ...

Math
All students in Peter's class have \$1.05, consisting of nickels and/or dimes and/or quarters. Each student has a different combination of coins, and all possible combination of coins are included. What is the probability that Peter is unable to give his friend Jenny change...

\$500 = 3 clients \$22,000 = x clients 500x = 66,000 x = 132 Tony needs 132 new clients

English
soil

Calculus
tan(θ) = y/x = 5/12 Find r r^2 = x^2 +y^2 = 12^2 + 5^2 = 144 + 25 r = Square Root (169) r = 13 sin(θ) = y/r = 5/13

U.S. Government and Politics
Which statement best describes the significance of the Magna Carta?

science
What is the molarity of a solution of sodium chloride which contains 0.5moles in 200cubic centimeters? #2.what volume of 1m solution of hcl will contain 10moles?

physics
a helium atom is in one of its single states.one of the electrons is in an p-state and the other a D-sate.the atom is placed in a magnetic field,B,of strengh 3 tesla. sketch a diagram showing the degenerated states and all permissible transition from D-state b)Determine by how...

Science
0.9866 g

Hamlet
How does Hamlet show his Heroism?

math
70/800 8.75%

math
70/800

math
in an experiment, it was found that 70 out of 800 animals were happy in their surroundings. a find probability that an individual animal is happy in their surroundings. b. represent as a percent

math
second half is if both marbles are green

math
a box contains seven red marbles, five green marbles & eight blue marble. a marble is drawn at random & is replaced. a second marble is then draw from the jar. find the probabilty that both marbles are green

math
no

math
4 red marbles, 3 green, 2 yellow. you pick 2 at random.What is probability of a. 1 yellow & 1 red b. 2 green

math
a box contains seven red marbles, five green marbles & eight blue marble. a marble is drawn at random & is replaced. a second marble is then drawn from ther jar. find the probabilty that the first marble is red & second is green

Descriptive Physics
You are standing 5 feet from one speaker and 14 feet from another. Both speakers are producing the same sound. If the combined sound from both speakers is especially loud at your location, which of the following could be the wavelength of the sound? Choose all that apply. 1 ...

math
I am a number less than 3,000.When you divide me by 32, my remainder is 30. When you divide me by 58, my remainder is 44. What number am I.

physics
Pure helium is closed into cylinder with a movable piston. The initial volume, pressure, and temperature of the gas are 15 dm3, 2·105 Pa, and 300 K, respectively. If volume is decreased to 12 dm3 and the pressure increase to 3.5·105 Pa find the final temperature of ...

physics
A police car siren emits a sound wave with a frequency fs = 400 Hz and it is moving toward the wall at 25 /m/s. What frequency reflected from the wall does the driver of the police car hear ? The speed of sound is 340 m/s.

math
Dee used 2 1/3 cups of sugar for a cake recipe.If the amount of sugar the container holds is 3 times the amount she used,does the container hold more than,less than,or equal to 3 cups of sugar

math
Derek ran 3/8 of a race he had to stop for a break.If the race is 6 miles long,did Derek run more than,less than,or equal to 6 miles before he took a break?

math
Maresol spent 4/5 of her allowance on a pair of jeans.If she received \$15 for allowance,did Maresol spend more than,less than,or equal to \$15 on the jeans?

Physics
A ball with a mass of 4 kg and a velocity of 10 m/s strikes an 8kg ball that is initially at rest. If the collision is perfectly elastic, what are the velocities of the 4 kg and 8 kg ball after the collision?

1: it is saying, six people are sleeping, to find total it is 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2 + 8 1/2. and your answer came out to be 51. TRUE :) 2: 6 1/2 * 1 1/2 is 13/2 * 3/2 which is 39/4! this is really 9 3/4 WHICH IS NOT 10! Oliva is wrong! hahaha! so that is your ...

math
maresol spent 4/5 of her allowance on a pair of jeans.if she received \$15 for allowance,did maresol spend more than,less than,or equal to 3 cups of sugars?explain

Chemestry
2Fe + 3O2 --> 2Fe2O3

Biology: Genetics
that's true, also nucleotides affect DNA in deciding what it codes for; therefore it is affecting structure in general.

Math
A train leaves San Diego at 1:00 PM. A second train leaves the same city in the same direction at 4:00 PM. The second train travels 78 mph faster than the first. If the second train overtakes the first at 6:00 PM, what is the speed of each of the two trains?

Vani school
1 whole pizza, also quick grammar lesson, of each pizza* <3

Geometry
6/30 proportion of his height to where he is standing x/45 what we don't know and the distance of the flag pole 6/30=1/5 simplifying x/45 1/5=x/45 setting them equal x=9 if we sole we will get this For further help/ understanding draw the picture and see how these ...

Algebra
a farmer fences off a small.rectangular plot of land thay is 60 feet by 100 feet. within that area, a garden is planted and surrounded by a walkway of uniform width. how wide is the walkway if the area of the planted area is one half of the area of the plot?

math
How can x-8 be modeled by being described as a situation? Answer:8x

Finance
Problem 10-32 Project Evaluation [LO1] Aria Acoustics, Inc. (AAI), projects unit sales for a new seven-octave voice emulation implant as follows: Year Unit Sales 1 86,000 2 99,000 3 113,000 4 108,000 5 89,000 Production of the implants will require \$1,650,000 in net working ...

U.S. History (Check)
good job

Math
A bag contains 5 red, 7 yellow, 8 green, and 3 blue markers. What is the p(two green markers) will be chosen if the markers are not replaced as they are chosen?

calculus
A snowball is melting at the rate of 2 inches per hour. How fast is the surface area of the snowball changing at the instant the snowball has a radius of 3 inches i tried (d/dt) = 4pir^2 (dr/dt) its multiple choice and -72pi isnt there so im just trying to figure this out

Physics
Which one of the following actions would make the maxima in the interference pattern from a grating move closer together? A.Increasing the distance to the screen. B.Increasing the number of lines per length. C.Decreasing the number of lines per length. D.Decreasing the ...

Q1.With the aid of a diagram discuss the marketing systems Q2.Discuss the problems that occur when universities and industry form joint ventures for research purposes.How have these problems been solved?

probability
E[T]=9

chemistry
under what conditions could the decomposition of Ag2O(s) into Ag(s) and O2(g) proceed spontaneously at 298 K? 2Ag2O(s)---->4Ag(s)+O2(g) dG=22.42 Kj answer= 0.000118 atm.

chemistry
dG for the formation of Hi(g) from its gaseous elements is -20.2 kj/mol at 500k. when the partial pressure of HI is 10 atm, and I2 0.001 atm, what must the partial pressure of hydrogen be at this temperature to reduce the magnitude of dG for the reaction to 0. H2(g)+I2(g)----&...

college chemistry
at its melting point, O c, the enthalpy of fusion of water is 1.435 kcal/mol. what is the molar entropy change for the melting ice at 0C? answer: 5.26 cal/mol-k

college chemistry
thanks

college chemistry
for the reaction at 298 K 2A+b ---->C enthalpy=100 K/cal entropy= 0.050 kcal/k assuming enthalpy and entropy to be constant over the temperature range, at what temperature will the reaction become spontaneous? answer: T>2000K

college chemistry
im confused i found those as the standard enthalpies and entropies for pcl3? i cant get answer

college chemistry
is it 306.4/33.2?

college chemistry
what is dHvap?

college chemistry
estimate the normal boiling point of Pcl3 answer: 333 K how do you get it?

Chemistry
Check my work & answer please. I need to make sure I am able to do this type of problem correctly. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity ...

Chemistry
4. A typical car engine produces 44,000 kJ of heat in an hour. The cooling system has a capacity of 8.40 L and is filled with a 50:50 mixture of anti-freeze (specific heat capacity of 8.37 J/g-oC, density of 1.038 g/mL). In maintaining a constant engine temperature, the ...

Physics
A 1100- kg car collides with a 1400- kg car that was initially at rest at the origin of an x-y coordinate system. After the collision, the lighter car moves at 20.0 km/h in a direction of 25 o with respect to the positive x axis. The heavier car moves at 23 km/h at -50 o with ...

GEOMETRY
cASEY SIGHTS THE TOP OF AN 84 FOOT TALL LIGHTHOUSE AT AN ANGLE OF ELEVATION OF 58 DEGREE. IF CASEY IS 6 FEET TALL, HOW FAR IS HE STANDING FROM THE BASE OF THE LIGHTHOUSE. I DO NOT UNDERSTAND WHAT IS ANGLE OF ELEVATION CAN YOU SHOW ME AN EXAMPLE PLEASE THANK YOU.

Earth Science
You doing this? pkwy.k12.mo.us/homepage/skang/file/Astronomy%20Review.pdf From here the answer would be C - Full moon.

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