Wednesday
July 30, 2014

Posts by Mark


Total # Posts: 1,257

Psychology
Phyllis is anxious to ride the parachute drop at the park. Her friend, Betsy, feels faint at the thought and does not enjoy watching others ride. These different reactions demonstrate that _______________. 
 A. perception of stress varies among individuals̷...

Psychology
Ralph was the third child born to a family of seven. At times his mother confused his name with those of his five brothers. His was never the tallest, the strongest, the fastest, or the smartest in school. He was also too little to do something or too old to be "acting th...

Math
In the Capital Asset Pricing Model, the market risk premium is estimated over a long period of time because: A. more data is always better than less. B. a longer holding period gives a more reliable estimate because it is, in effect, a larger sample size. C. almost all investo...

Math
In the Capital Asset Pricing Model, the market risk premium is estimated over a long period of time because: more data is always better than less. a longer holding period gives a more reliable estimate because it is, in effect, a larger sample size. almost all investors hold s...

General Math
A. rx is the return for a market index such as the S&P 500 Index. B. rx is the return for the stock being analyzed for example, IBM s return if we are estimating IBM s beta. C. the slope measures the average return for the market portfolio for each percentage change in the val...

Finance
I think that it is B the risk rate of return plus a risk premium

Finance
A. as the highest return a risk-averse investor wants from an investment. B. as the risk-free rate of return plus a risk premium. C. as the historical rate of return plus a risk premium. D. as a comparison between the expected and historical rates of return

Maths
this question is incomplete.

Math
Brilli the ant has a block of cheese that is in the shape of an equilateral triangle. She is hosting a party, and has invited her two-legged house mates. She insists that all of her guests get a piece of cheese that is in the shape of an isosceles triangle. What is the maximal...

Math
In triangle ABC, D is the midpoint of BC. E is the foot of the perpendicular from C to AD. If CD=7√,DE=3√, what is the measure (in degrees) of ∠BED?

Math
Brilli the ant has a block of cheese that is in the shape of an equilateral triangle. She is hosting a party, and has invited her two-legged house mates. She insists that all of her guests get a piece of cheese that is in the shape of an isosceles triangle. What is the maximal...

Math
Let ABCDEF be an equiangular hexagon with perimeter 98 such that EF=2CD=4AB and BC=2FA. What is the length of EF?

Math
How many {(1,1),(1,−1),(2,0)}-lattice paths are there from the point (0,0) to the line x=8? Details and assumptions A lattice path is a path in the Cartesian plane between points with integer coordinates. A step in a lattice path is a single move from one point with inte...

Physics
You bounce on a huge trampoline and start oscillating up and down with a period of 3 s. After a long while, you come to rest but the trampoline below you is displaced below its natural height. How much is the trampoline bent in m? Model the trampoline as a spring.

Math (algebra)
Let x and y be real numbers satisfying 4x^2+5y^2=1. Over all such pairs, let the maximum and minimum values of 2x^2+3xy+2y^2 be M and N respectively. If M+N+MN=a/b, where a and b are coprime positive integers, what is the value of a+b?

Essay
Can someone help me please I have to write a essay on if you won a million dollars and cannot spend it on yourself or family what would you do with it. I need help to start it just the opening line please

Math (please help me Steve)
The squares of a 3×3 grid are filled with non-negative integers such that the sum of each row and the sum of each column is 7. How many different ways can the squares be filled? The numbers in each grid square does not need to be distinct. Rotations and reflections are d...

Physics (help steve)
no, it's wrong

Physics (help steve)
A boy is spinning on a chair and holding a paper bag so that it is horizontal, and perpendicular to the axis of the rotation. What should be the angular velocity of the boy in radians/second so that the bottom of the bag breaks? Details and assumptions Assume paper breaks at a...

Math (please help steve)
The squares of a 3×3 grid are filled with non-negative integers such that the sum of each row and the sum of each column is 7. How many different ways can the squares be filled? The numbers in each grid square does not need to be distinct. Rotations and reflections are d...

Math (algebra)
For every positive integer n, consider all monic polynomials f(x) with integer coefficients, such that for some real number a x(f(x+a)−f(x))=nf(x) Find the largest possible number of such polynomials f(x) for a fixed n<1000.

Math
The squares of a 3×3 grid are filled with non-negative integers such that the sum of each row and the sum of each column is 7. How many different ways can the squares be filled? The numbers in each grid square does not need to be distinct. Rotations and reflections are d...

Calculus
A spherical fish tank of radius 8 meters is being filled with at a constant rate of Rπ meters cube of water per second. At height 3 meters, the rate of change of the height is 1 meter per second. What is the value of R?

Calculus
Let V be the volume of the three-dimensional structure bounded by the region 0≤z≤1−x^2−y^2. If V=a/bπ, where a and b are positive coprime integers, what is a+b?

Calculus
Let R be the region bounded by y=−3(x−1)(x−3) and the x-axis. Let S be the solid obtained by rotating R about the y-axis. The volume of S is given by Nπ. What is the value of N?

Calculus
There are two points P=(a,a^2) and Q=(b,b^2) (a<b) moving along the parabola y=x^2. If the area of the region bounded by y=x^2 and the line segment PQ is always 36, what is the value of lim as a→∞ of PQ/a?

Chemistry
A metal crystallizes in a face-centered lattice. The radius of the atom is 198pm and the density of the element is 6.57g/cm^3. What is the identify of the metal?

Chemistry
Bulb A is 100 mL and contains Helium at 1 atm. Bulb B is 500 mL and contains Argon at 2 atm. The bulbs are connected together by a valve. What is the pressure of gas A after the valves are opened? (assume constant temperature)

chem
What will be the final volume of a 425 mL sample of gas initially at 22 degrees C and 1 atm pressure when the temperature is changed to 30 degrees C and the pressure to 0.471 atm?

MATHS
remember me stupid boy

MATHS
thats my friend

math
Angle P and Q are a linear pair. Angle Q is 36 degree less than twice of angle P. The measure of angle P is ? degree, and the measure angle Q is ? degree.

Physics
7) An apple falls from a tree (h = 9m). In the absence of air resistance, how fast is it traveling when it strikes the ground?

Science
7) An apple falls from a tree (h = 9m). In the absence of air resistance, how fast is it traveling when it strikes the ground?

math
Determine the area of the region between the curves: f(x) = -(3)x^3 + (6.25)x^2 + (27.1875)x - (9.328125) and g(x) = (1)x^2 + (3)x -(3)

Math
Determine the area of the region between the curves: f(x) = -3x^3 + 6.25x^2 + 27.1875x - 9.328125 and g(x) = 1x^2 + 3x -3

Math
Determine the area of the region between the curves: f(x)= 3x^2 + 16x + 28 and g(x) = -2x + 1

science grade 8
Please, explain why do you think that blowout preventer (BOP)was likely a hydraulic system (in the 2010 Deep Water Horizon oil spill accident), and what are the advantages and disadvantages of this hydraulic system in the Deep Water Horizon oil spill. Give an example from this...

social studies
Payment to workers, his dependents,and/ or survivorsin the event of retirement, disabilityor death are generally covered by the system of insurance known as ?

History
Thanks Ms. Sue, very helpful

Hisory
Why is the Benghazi Attack such a controversy? I need to answer this in a few sentences which I am having a hard time doing. I wrote my paper but I can't seem to summarize it.

Math - PLEASE HELP
Can someone help me answer this? Determine F ' (x) and F ' (1) if F(x) = integral sign lower limit = 4, upper limit = x 4t^10 (2 t^(1) 0 + 8 ln t) ^4 dt a) F ' (x) = b) F' (1) =

Math
Can someone help me answer this? Determine F ' (x) and F ' (1) if F(x) = integral sign lower limit = 4, upper limit = x 4t^10 (2 t^(1) 0 + 8 ln t) ^4 dt a) F ' (x) = b) F' (1) =

math
Sorry I posted this question earlier with a error. Can anyone help me solve this now? Can someone help me answer this? If a < 5 the define integral [a, 4] 2.4e^(1.4x)dx = 44 Find the value a Define integral = integral sign a = lower limit 5 = upper limit

math
Can someone help me answer this? Determine F ' (x) and F ' (1) if F(x) = integral sign lower limit = 4, upper limit = x 4t^10 (2 t^(1) 0 + 8 ln t) ^4 dt a) F ' (x) = b) F' (1) =

math
Can someone help me answer this? If a < 5 the define integral [a, 4] 2.4e^(1.4x)dx = 44 Find the value a Define integral = integral sign a = lower limit 4 = upper limit

math
Can someone please help? Solve the differential equation dy/dx = 6xy with the condition y(0) = 40 Find the solution to the equation y= ______

chemistry
Consider what happens to Ag2CO3 in aqueous solution. It dissociates as thus: Ag2CO3 --> 2Ag^+ + CO3^2- Now think about reactions of CO3^2- with water. The problem says to ignore Ag+ subsequent reactions. H2O <-> H3O^+ + OH^- CO3^2- + H3O^+ <-> HCO3^- + H2O HCO3^...

math grade 8
Hi! I have to sketch 3D shape of the house using triangular prism, rectangular prisms, cube, and cylinder.I have to include measurement calculations with formulas. I already did it all, but someone told me that the SA (surface area) of my house calculated wrong. What I did is:...

mathematic
0.06

U.S/history AP
I think the answer to number one is annexation.

Algebra
The value, V< of Juan's investment portfolio can be modeled by the equation V=16t^2-256t+16,000. When will Juan's investment portfolio be worth $16.576.00?

Algebra
The value in dollars, V, of a certain stock can be modeled by the equation V=-16+88t+101, where t represents the time in months.When did the stock become worthless?

Biochem
What is the maximum amount of ethanol (in millimoles) that could theoretically be produced under the following conditions? Condition: A cell-free yeast extract is placed in a solution that contains 3.50 × 102 mmol glucose, 0.30 mmol ADP, 0.30 mmol Pi, 0.60 mmol ATP, 0.2...

Math (Percentage)
In a class of 40 , 12 students failed the exam. What was the passing rate of the said class?

Math (Percentage)
In a class of 40 , 12 students failed the exam. What was the passing rate of the said class?

Math (Algebra)
A jar contains x nickels and y quarters only. What percentage of the total number of coins are quarters?

Math
A newly designed international airport is planning to label its gates. Each gate must be assigned a letter from the alphabet from A to M (13 in all), and a number from 1 to 15. To avoid confusion, any two gates must be assigned a different letter, or a different number (or bot...

Math
A newly designed international airport is planning to label its gates. Each gate must be assigned a letter from the alphabet from A to M (13 in all), and a number from 1 to 15. To avoid confusion, any two gates must be assigned a different letter, or a different number (or bot...

Math
A newly designed international airport is planning to label its gates. Each gate must be assigned a letter from the alphabet from A to M (13 in all), and a number from 1 to 15. To avoid confusion, any two gates must be assigned a different letter, or a different number (or bot...

physics
A bridge is supported at both ends (500m between supports). A Car (250 Kg) is at 100m from the left support. A truck (4000 Kg) is at 200m from the left support. Find the forces on the supports

Science help
D. All of the above

math problem
A piece of wire 24 cm long is cut into two pieces and each piece is bent to form a square . Find the lenght of each piece of wire in order to maximize the sum of the area of the two squares?

chem
This question has already been posted. Please don't flood the site with repetitive posts. The tutors work very hard to answer as many as they can.

Chemistry
Thank you Mr. Devron! I learnt something from you as well. The compound is Antimony Pentoxide, and I did indeed not realize that after dividing by the lowest moles you can multiply!

Chemistry
You need to know the molar ratio for Antimony Oxide! Since Sb has an oxidation of +3 and Oxygen has a oxidation of -2, you need two Sb atoms and three O atoms. Sb2O3 Figure out how many moles you have of antimony and oxygen.. 51.5 g Sb * 1 mol/ 121.76 g= 0.43 moles Sb 16.9 g O...

Is this correct?
Thank you.

Is this correct?-Mean value Theorem
Sorry I forgot to include the topic.

Is this correct?
What values (c) if any are predicted by the mean value theorem for the function f(x)= (x-2)^3 on the interval [0,2]? I got x= 4 and x=0, since x=0 is within the interval I chose that as my answer. Thank you.

Chemistry
You will have to find the molar mass here.. 200 ml * 0.1 mol/ L * 1 L/ 1000 mL= 0.02M 250 ml* 0.2M/ L * 1L/ 1000 mL= 0.05M N I somehow feel this problem is incomplete or either I am unable to understand the chemical compound name. Is there anymore to it?

Slope- Derivative
Thank you!

Slope- Derivative
Find the slope of f(t)= sqrt((1-sin (2t)) a) at point (0,1) i got -1 b) at origin i got 1 is this right thanks

Derivative-Word Problem
I read more about related rates, and have now understood these types of problems. Thank you!

Derivative-Word Problem
Volume in liters of antifreeze remaining in a leaking radiator after t minutes is V= 20- 2t- 0.1t^2 a) how long does it take to drain the antifreeze mixture from the radiator? i got t= 10 b) how fast is volume changing when t=5? i got 9.75 is this right. thanks

Word Problem-Calculus
My fault lied in plugging in directly. Thank you for showing me the steps.

Word Problem-Calculus-Already Solved-Please check?
Thank you!

Word Problem-Calculus
A spherical balloon is being inflated in such a way that its radius increases at a rate of 3 cm/min. If the volume of the balloon is 0 at time 0, at what rate is the volume increasing after 5 minutes? my answer is 45 cm/min. is this right. thanks

Cos-Derivative
Thanks!

Cos-Derivative
y= (cos^3 x) (cos 3x) I got -3 sin(3x) cos^3x - 3 sin(x) cos (3x) cos^2 (x) using the product rule Is this right? Thanks.

Derivatives
I have taken that into consideration; thank you!

Derivatives
I got 12 sin (3x-1)^2 cos (3x-1)^2 * (3x-1) as my final answer. Is this in the correct simplified form ?

Derivatives
I'm not sure if this is correct. Can someone clarify thanks.

Derivatives
what is derivative of sin^2 (3x-1)^2 ? dy/dx (sin^2 (x))= 2 sin x cos x dy/dx (3x-1)^2= 6(3x-1) chain rule? = 2 sin ((3x-1)^2) cos ((3x-1)^2) * 6(3x-1) Please help. Thank you

Math: Please check
This is correct!

Math: Please check
W= 5L So the side lengths are 5L and L. by definition of a right triangle (5L)^2 + (L)^2= ? 25L^2 + L^2= 26L^2 This matches choice C.

math problem
- Mr. Hermann, a stamp collector , sold 2 stamps for $5000 each. Based on his cost , he made a 25% profit on one stamp and lost 20% on the other stamp. What was Mr. Hermann's total loss on the two transactions? - There are five chidren in the Roberts family. Amy and Ariel ...

Pleass Help With MATH
Read this story to answer the following questions: Diego is building an architectural rendering of a house. For a portion of the roof, Diego cuts and folds a net for a triangular prism. the base of the prism is an isoceles triangle. the triangle has a base of 24 inches and a h...

3rd math
2 53 x7 371 No rick is not correct because 53x7=371

mAth
story: Diego is building an architectural rendering of a house. For a portion of the roof, Diego cuts and folds a net for a triangular prism. the base of the prism is an isoceles triangle. the triangle has a base of 24 inches and a height of 5 inches. the distance between the ...

Statistics
The rate of chlamydia infection was reported as 2.78% in a recent year. Under certain conditions, a preliminary screening test for the chlamydia bacterium is correct 96% of the time. One person is randomly selected from the population. find the true positive. Can someone pleas...

stats
okay, so I think the true positive is 96%, but what about the true negative, false positive and the false negative?

stats
The rate of chlamydia infection was reported as 2.78% in a recent year. Under certain conditions, a preliminary screening test for the chlamydia bacterium is correct 96% of the time. One person is randomly selected from the population. find the true positive. Can someone pleas...

Math
He spent 2/3 of his money. The movie cost 6. How much does he have left

physics
A softball bat is rotating at 460 rotations per minute at contact with the ball. What is the angular velocity in radians?

physics
A skater rotates 760 degrees clockwise, stops, and rotates counterclockwise for 340 degrees. What is her angular distance? Angular displacement?

physics
A softball player swings her bat through her full range of motion of 392 degrees in 0.3 secs. What is the angular velocity of the bat? What is the average acceleration of the bat?

physics
In order for a ski jumper to attain maximum projectile distance she must reach a velocity of 30m/s. of the runway of the takeoff ramp is 70m long, how quickly ust she accelerate?

physics
A freestyle skier hits the take off ramp with an initial velocity of 17.5 m/s with a purely vertical take off (90 degrees). What is the peak height that the skier will reach?

physics
A shot-­‐putter releases the 16 lbs. shot at an angle of 41 degrees. If the shot travels a horizontal distance f 34 m to reach its peak at midflight, how high did the shot go and what is the displacement of the resulting vector at midflight?

physics
A cyclist has a final velocity of 30 m/s after coasting down hill for 2 seconds. If the cyclist underwent a constant acceleration of 7.5m/s2 during the descent, what was his initial velocity at the top of the hill?

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