Thursday
December 8, 2016

# Posts by JEFF

Total # Posts: 787

Statistics
The mean of a distribution of 1000 individuals' blood pressure is 85. If this number were translated into a Z score it would be equal to +1 standard deviations. True or False? I know to calculate a Z score the formula is Z= (X-sub-i minus the mean)/ standard deviation. the...
February 11, 2014

Physics
Police find skid marks 60 m long on a road showing where a car made an emergency stop. Assuming that the deceleration was -10m/s2, how fast was the car going?
February 9, 2014

Math
What is the solution to the inequality below? 12x > 6(x - 2)
January 15, 2014

Pre-Calculus
Find an equation of the line that satisfies the given conditions Through (-2,4); slope -1 How would you solve that by using the point slope form and writing it in the general equation of a line? ax +by + c =0
January 11, 2014

Pre-Calculus
Find an equation of the line that satisfies the given conditions Through (-2,4); slope -1
January 11, 2014

math
Can someone check my answers: write out each problem with repeated addition. 3*0= 0*13= 20*0= I got 0+0+0 0+0+0+0+0+0+0+0+0+0+0+0+0 0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0
January 8, 2014

3-D Coordinates Polar coordinates Precalculus Trig
Sorry, never mind. I figured it out.
December 18, 2013

3-D Coordinates Polar coordinates Precalculus Trig
Hi. I don't understand why you multiply by 50*pi/180. The 50 degrees is the difference in the longitude, but why isn't that divided by 360? Why the pi/180? If someone could clear that up I would appreciate it.
December 18, 2013

Hello Sue, the answer is a simile. Please read the following: Each of these he set adrift like a paper boat on a shifting sea of daydreams. He did that encased in the drone and shudder of diesel pistons and hissing tires. Jamie Sabin was going home to a place unknown. With ...
December 17, 2013

The answer to this question IS NOT "B". What is the answer to the following question. Inside the bus, in his summer Class-A uniform with its brass glitter and infantry-blue shoulder cordon, Jamie Sabin was going home. Fort Benning would be a fading dream; Preston, ...
December 17, 2013

Inside the bus, in his summer Class-A uniform with its brass glitter and infantry-blue shoulder cordon, Jamie Sabin was going home. Fort Benning would be a fading dream; Preston, Virginia, a place unknown, his future. He was in between, fumbling with puzzle pieces, making up ...
December 17, 2013

In American society, romantic love is considered the main reason for people to marry. On the other hand, in some societies, romantic love is considered a form of obsession or madness. In fact, even in many societies where "true love" is not considered a form of ...
December 16, 2013

science
2. According to your text, the groundwater aquifers of India have been severely over pumped. (Points : 1)
December 15, 2013

Math #2
Can you show me the work to get these answers also? 2.Use the function, f(x)=3x^2-16x+5/(3x-1)(x+4)^2: a. Find the domain of f(x) in interval notation b. Factor and simplify f(x) completely. c. Find the x-intercept(s), if any. d. Find the y-intercept, if any. e. Determine the ...
December 8, 2013

Math #2
Can you show me the work to get these answers also? 1.Given g(x)=x^3+5x^2+6x+30,find: a. All real/complex zeros. b. All x-intercept(s),if any.
December 8, 2013

Math
Can you show me the work to get these answers also? A.Solve each equation. Leave exact answers: 1.5^3x-2=14 2.log(x-1)-logx=log(x-3) B.If f(x)=x+2/x and g(x)=7/x-5, a. Find the composition (f o g)(x) and simplify completely. b. Find the domain of (f o g)(x).Write answer in ...
December 8, 2013

Classical Mechanics - Need Help Please
You beauty, Thanks bw. All I have left is the falling ruler if you have any advice for that one. Otherwise thanks a million!
December 8, 2013

Classical Mechanics - Need Help Please
bw, For the above question (the block of mass 3kg one) I am still getting the incorrect answer for your answer of c.) 44.99 Is it possible this is incorrect still?
December 8, 2013

Classical Mechanics - Need Help Please
A block of mass m= 3 kg is initially at rest on a horizontal surface. At time t=0, we begin pushing on it with a horizontal force that varies with time as F(t)=βt2, where β= 1.2 N/s2. We stop pushing at time t1=5 s [F(t)=0 for t>t1]. (a) First, assume the surface ...
December 8, 2013

Classical Mechanics Physics - Urgent help please
Hey Damon, Part b and c: (b) What is the force exerted by the wall on the ruler when it is at an angle θ=30∘? Express your answer as the x component Fx and the y component Fy (in Newton) Fx= Fy= (c) At what angle θ0 will the falling ruler lose contact with the ...
December 7, 2013

Math
4x-3y=5 Solve { 5y+7=3x using the method of elimination.
November 27, 2013

Math
Determine the equation of g(x) that results from translating the function f(x) = x2 + 3 upward 14 units. g(x) = (x + 17)2 g(x) = (x + 14)2 + 3 g(x) = x2 - 11 g(x) = x2 + 17
November 24, 2013

Finance
I got 68016.92
November 8, 2013

Math
It's a NUMBER? It is divisible by 3 but not by 9 or 15. It is not an even number and it is less than 90. The sum of it is 12 and it could be the Product of 27..... What NUMBER??
November 7, 2013

Science
What is a substance that cannot be separated into simpler substances by physical or mechanical methods such as filtering, boiling, or sifting?
October 25, 2013

physics
(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) ...
October 4, 2013

physics
(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) ...
October 4, 2013

MircoEcon
Agree or disagree with this statements and explain: If the demand for a good has unitary elasticity, or elasticity is -1, it is always true that an increase in its price will lead to more revenues for sellers taken as a whole.
September 30, 2013

trigonometry
the bases of a trapezoid are 22 and 12 respectively. The angles at the extremities of one base are 65^ and 40^ respectively. Find the two legs
September 1, 2013

Math
If a car is traveling at 60 mph how long would it take to slow to 30 if slammed on the brakes?
September 1, 2013

statistics
Archie must travel to a foreign country where a deadly strain of flu has ravaged the population. Already, 34% of the population has succumbed to the flu and died. There is a vaccine, but because the flu is extremely contagious, it spreads quite rapidly, and to date only 1 out ...
August 2, 2013

bus 123
Carol Miller went to Europe and forgot to pay her \$850 mortgage payment on her New Hampshire ski house. For her 55 days overdue on her payment, the bank charged her a penalty of \$26. (assume 360 days). What was the rate of interest charged by the bank?
August 1, 2013

Science
For example HNO2 + H20 ----> H30+ NO2- I don't understand how the hydronium ions form. How do I figure out if a OH- or H30+ will form from the reactant side.
July 30, 2013

stats
Cheating is not allowed. HRP258
July 16, 2013

math
a 5000lb. truck traveling at 30 miles per hr. hits a herd of horses bring the truck to a dead stop what is the force of impact?
July 7, 2013

U.S. Government
The social group that has the most influence on how you vote is in your --m---.
June 27, 2013

calculus
In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
May 16, 2013

calculus
In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
May 16, 2013

calculus
please help me Asap In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in ...
May 16, 2013

Finance
Calculate the future value of \$5000 given that it will be held in the bank for 6 years and arn an annual interest rate of 7%.
May 8, 2013

math
May 6, 2013

geometry
What are the internal angles required to make a pentagon with 36 millimetre sides?
May 5, 2013

geometry
What are degrees of angles for pentagon with 36 sides
May 5, 2013

physical aspects
A 600 lb. oak packing crate is sitting on a cross grained, 14 ft long, oak ramp. The force of the box against the ramp is 520 lbs, and the downhill force on the box is 300 lbs. Will the box slide down the hill all by itself? Give the box a nudge, will it stop? If the box will ...
May 5, 2013

Science-Greenhouse Effect
idc I got a 8b so its very easy if u put ur head doen and listen to the teacher I'm in year 8
April 23, 2013

Physics
The cannonball is fired at a speed of 45 and an angle of 35 . A cannonball that was accidentally dropped from the top of the castle wall hit the moat below in 1.8 .
April 20, 2013

Chemistry
calculate the minimum number of grams of C3H8(g) that must be combusted to provide the energy necessary to convert 3.36 kg of H2O from its solid form at -10.0°C to its liquid form at 80.0°C
April 15, 2013

Chemistry
3.00 g of H2 reacts with 200.0 g of AgCl. what is the yield?
April 15, 2013

LA
so its C
April 10, 2013

LA
April 10, 2013

LA
What was the Supreme Court's ruling on the Dred Scott case? Dred Scott should be considered free since he had lived in many states where slavery was banned. Dred Scott could be free if he paid a fee. Dred Scott was still a slave and not a citizen. The case never reached ...
April 10, 2013

Chemistry
What mass of silver can be produced by reacting 0.300 L of 0.100 M AgNO3 with an excess of Mg?
April 9, 2013

LA
thanks
April 8, 2013

LA
What do you learn from the dialogue between Mr. Frank and Miep at the beginning of Scene 1? A;Miep wants to show Mr. Frank something in the building. B;Mr. Frank wants to live in this building to hold on to his memories. C;The war has ended, but Mr. Frank does not want to ...
April 8, 2013

chemistry
Sodium fluoride and lead nitrate are both soluble in water. If 1.13 g of NaF and 0.232 g of Pb(NO3)2 are dissolved in sufficient water to make 1.00 L of solution, will a precipitate form? How do you know if there should be a precipitate or not? What is the chemical formula for...
April 7, 2013

science need help
2 H2 + O2 = 2H2O 2 grams + 32 grams=_ _ _ _ _grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogeb that reacts. in your response be sure to: include they type of change illustrated in the balanced eqaution explain the conservation ...
April 1, 2013

science need help
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
April 1, 2013

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013

science
2 H2 + O2 -> 2 H2O 2 grams + 32 grams -> _ _ _ _ _ grams how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogen that reacts? include types of change illustrated in the balanced equation. explain the conversation of matter and ...
March 31, 2013

science
when 1 gram of water evaporated the volume of the water vapor increases but the mass remains constant. why does the water remain constant i think because the number of atoms remain constant
March 31, 2013

science
why the tilt of axis causes summer to be warmer than winter in the northern hemisphere i put because the rays of the sun strike the northern hemisphere more directly in the summer. but it could also be because northern hemisphere is closer to the sun in the summer.
March 31, 2013

Chemistry
Consider the titration of 100.0 mL of 0.100 M H2NNH2 (Kb = 3.0 10-6) by 0.200 M HNO3. Calculate the pH of the resulting solution after the following volumes of HNO3 have been added. a)0.0 mL b)20.0 mL c)25.0 mL d)40.0 mL e)50.0 mL f)100.0 mL
March 23, 2013

English
March 22, 2013

math
Combine the like terms (6a^4b - 6a^4b) + (ab^3 + 3ab^3) = 0a^4b + 4ab^3 = 4ab^3
March 16, 2013

spanish
what does ella mean
March 11, 2013

physics
A 36 cm long copper wire carries a current of 6.0 A and weighs 0.45 N. A certain magnetic field is strong enough to balance the force of gravity on the wire. What is the strength of the magnetic field?
March 10, 2013

physics
A wire that is 70 cm long, carrying a current of 6.5 A, is at right angles to a uniform magnetic field. The magnitude of the force acting on the wire is 0.60 N. What is the strength of the magnetic field?
March 10, 2013

physics
A wire that is 0.45 m long and carrying a current of 9.5 A is at right angles to a 0.40 T magnetic field. How strong is the force that acts on the wire?
March 10, 2013

physics
The force acting on a wire that is at right angles to a(n) 0.80 T magnetic field is 2.1 N. The current in the wire is 6.7 A. How long is the wire?
March 10, 2013

physics
A wire that is 630 m long is perpendicular to a 0.31 T magnetic field. A 1.8 N force acts on the wire. What current is in the wire?
March 10, 2013

physics
A wire that is 46 cm long is parallel to a 0.54 T uniform magnetic field. The current through the wire is 4.5 A. What force acts on the wire?
March 10, 2013

math
Solve equation for Y 2x + 8y = 6 8y = 6 - 2x y = 3/4 - x/4 Since this is a straight line, we can pick any value for X. Let's say X=2 Then y(2) = 3/4 - 2/4 = 1/4 Now, decrease x by 2, so x=0 y(0) = 3/4 - 0/4 = 3/4 The difference between Y(0) and Y(2) is 3/4 - 1/4 = 2/4 = 1/...
February 26, 2013

MATH
Change 1.9 hours into a form we can use. Let's break it into two parts. We know 1 hour is easy enough, and that will change the time to 4:05 PM (Subtract 1 hour from 5:05 PM). For the 0.9 hour part, let's change this to minutes. (0.9 hours)*(60 min / 1 hr) = 54 minutes...
February 26, 2013

geometry
Keep in mind it does not have to be in ratio of 3:4:5 to be a right triangle, it has to make the equation c^2=a^2+b^2 true. Another common right triangle is 5,12,13.
February 26, 2013

geometry
No...Use c^2=a^2+b^2. Use a= 24, b= 32 and c= 42 (the longest side). Take a^2 + b^2 and see if it eqauls c^2 If it does, it is a right angle. If it does not, it is not a right triange. In this case, it does not, so it is not a right triangle.
February 26, 2013

Algebra
2X + 1 r 2/(x-3)
February 25, 2013

Algebra II
1. Multiply out z^2 + 6z + 14z^2 + 84z + 45 = 0 2. Combine like terms 15z^2 + 90z + 45 = 0 3. Use quadratic equation to get both answers for z.
February 24, 2013

chemistry
A solution is prepared by mixing 50.7 mL of 0.28 M Pb(NO3)2 with 70.8 mL of 1.0 M KCl. Calculate the concentrations of Pb2+ and Cl - at equilibrium. Ksp for PbCl2(s) is 1.6 10-5.
February 21, 2013

Math 10
Yes, you are correct. Key word is circular, so we are talking about a circle. pi = circumference of a circle / diameter --> pi = C / d Solve for C C = pi*d = (3.14) *(10 ft) = 31.4 ft, assuming the approximation of 3.14 for pi.
February 19, 2013

Math 9
Think of a right triangle. The airport is the vertex of the right angle. Plane A is 70 miles north (Straight up). Plane B is 168 miles East (Straight right). From plane A to B would be side C of the right triange. C^2 = A^2 + B^2 C = sqrt (A^2 + B^2) C = sqrt (70^2 + 168^2) C...
February 19, 2013

Math 5
February 19, 2013

college algebra
If X^2-5 is the denom, then the domain would be all X such that the denom does not equal 0. So find when x^2-5=0 x=sqrt(5) (Both positive and negative) So the domain is all real numbers, such that X does not equal +- sqrt (5)
February 18, 2013

chemistry
Just wanted to say thanx for the help Bob
February 18, 2013

chemistry
Greg reacts 5.0 moles of hydrochloric acid(HCL)with 1.5 moles of barium hydroxide(Ba(OH)2).Which reagent is the limiting reagent, and which is in excess?If the reagent runs to completion,how many moles of barium chloride(BaCl2)will be produced? CAN SOMEONE PLEASE HELP ME....
February 18, 2013

Chemistry
Robby if you need more help,type ur question ino the search bar on your computor and a site titled chap15 fd.valenciacollege.edu will come up and it will break down complete indtructions on how to go about figuring out this question.I hope this helps.
February 18, 2013

math
Convert the 9m of cloth to cm = 900 cm to start with. She has 90 cm of cloth left so she used 900 cm - 90 cm = 810 cm of cloth Let X = cloth for tablecloth Let 2X = cloth for each cushion cover. The equation would be: 810 = X + 4 * 2x 810 = X + 8X 810 = 9X X=90cm 2X=2(90cm) = ...
February 18, 2013

math
\$38.40 = (1-0.40)* Price Price = \$38.40 = \$64.00 ------- 0.6
February 18, 2013

math
BAD is correct. It is 84. If you would like to use algebra, do the following: x:= Unit Digit Number y:= Tens Digit Number The units digit is 4 less than the tens digit number so We know that x=y-4 The tens digit is twice the units digit so we know that y=2x Now we can take the...
February 18, 2013

Algebra
BTW Cassie, please please always remember that pi is simply a circle's circumference divided by it's diameter. For every circle, no matter the size... This is why it shows up in so many formulas for circles, cylinders, cones, etc.
February 18, 2013

Algebra
Reiny, Agreed, but that is what it appears to be using. I am guessing it was a software program and not the actual computer using that approximation. What really irks me about pi is that most people know it is 3.1415....., but have NO idea what it actually represents....
February 18, 2013

Algebra
You did the problem correctly. I am not sure how exactly you entered the numbers into the computer for pi, but it looks like with an answer of 24,523.71 the computer used an approzimation for pi based on the fraction 22/7. 22/7 = 3.142857.... If you plug the 22/7 instead of 3....
February 18, 2013

Algebra
The answer would then be C. 160 cm^3 The Volume of a cone is given by V=(1/3)*pi*r^2*h We know V= 540 cm^3 and that r=15 cm and can plug into the equation to find h. I am going to leave the units off, but you should include it in your work. 540=(1/3)*pi*(15)^2*h Solving for h ...
February 17, 2013

Algebra
Could Answer c be 160 cm^3 and not 16 cm^3?
February 17, 2013

math
She could actualy do it several different combinations. 5 quarters, 1 dime, and 10 nickels 4 quarters, 5 dimes, and 7 nickels 3 quarters, 9 dimes, and 4 nickels 2 quarters, 13 dimes, and 1 nickel
February 17, 2013

We know the formula for the Volume of a Right Circular Cone is given by V=(1/3)*pi*r^2*h V=140 in^3 The height of the cone = diameter of the base. The diameter = 2 times the radius, so h = 2r The formula for Volume can now be written as V=(1/3)*pi*r^2*(2r) which simplifies to ...
February 17, 2013

math
Sharon swims 1/4 of the total route Swim = (1/4)*TotRoute Sharon cycles 3/5 of the remaining route Cycles = (3/5)*(3/4)*TotRoute Notice the 3/4. If she swam 1/4 of the total route, 3/4 of the route remains for cycling and running. Sharon runs rest of the route Runs = (2/5)*(3/...
February 17, 2013

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