Thursday
November 27, 2014

Posts by Joe


Total # Posts: 2,120

Math for Educators
The statement, "when I divide them by 2, there is a remainder of 1" means that the numbers must be odd, therefore they can't end in a 0. I'm only seeing 2 answers, 25 and 85
June 17, 2013

math
v(x) = 30000-1000x v(7) = 30000-1000(7) = $23000
June 17, 2013

Calculus
The slopes of the tangent lines are equal to the derivative of the parabola at the points. y ' = 2x, so y'(a) = 2a and y'(-a) = -2a. You can also use the slope formula m = (y2-y1)/(x2-x1) to find the slopes of the tangent lines. Therefore m = (a^2+3-(-6))/(a-0)=(a^...
June 17, 2013

Calculus
if p(2) = 6, substituting in the p(x) function, 6 = 4a + 2b + c p ' (x) = 2ax + b, therefore if p ' (2) = 2, this means that 2 = 4a + b p '' (x) = 2ax + b, therefore if p '' (2) = 3, this means that 3 = 2a and a = 3/2 substituting 3/2 for a in 2 = 4a + ...
June 17, 2013

Physics
Thanks!
June 17, 2013

Physics
A trapeze artist swings from one 35-ft long trapeze to another trapeze. She releases one trapeze at a 30 degree angle relative to the vertical. She flies through the air, catching the other trapeze 18 ft away at the same elevation. What was her release velocity?
June 17, 2013

Algebra
3x^2(2x^2 - 7x - 4) =3x^2(2x+1)(x-4)
June 17, 2013

rochester
A 3kg stone falls from rest a top a cliff, hitting the ground traveling 42m/s. How much force does it do on the ground below if that ground is compressed 0.30 meters? (w= F*d=KE-PE)
June 10, 2013

english
plz give me solutions of 10 class bbc compehensions answers
June 8, 2013

math
SOLVE FOR P, Q, &R p + 1/(Q+ 1/R)= 25
May 30, 2013

math
SOLVE FOR P, Q, &R
May 30, 2013

chemistry
explain why a balloon with 1.00 mol xe gas in it has the same volume as balloon with 1.00 mol he gas in it
May 21, 2013

physics
How long does it take light to travel through a 2.7 mm-thick piece of window glass?
May 19, 2013

algebra!!!! please help me!!!!
This is a Brilliant question. Please do not answer.
May 6, 2013

Algebra
Prove by mathematical induction that 3^(3n+1) + 2^(n+1) is divisible by 5
May 5, 2013

Geometry
Lines p and q are parallel and are intersected by transversal r. If angle 1 = 4x degress and angle 2 = 2x+24 degrees, what is the measure of angle 2?
April 30, 2013

American Government
Proportional representation systems like those in Western Europe encourage the formation of smaller parties by enabling parties to: A. win legislative seats even though they do not receive a majority of votes in elections. B. receive campaign funds from government in ...
April 30, 2013

chemistry
im so confused about this question Calculate the pH of a solution that has [H3O+] = 5.5 x 10-3.
April 29, 2013

math
mrs nelson has a rectangular flower box that is 5 feet long & 2 feet tall. she wants the width ofn the box to be no more than 5 feet. if the width is a whole number, what vare the possible volumes for the flower box?
April 29, 2013

algebra
A student traveled 206 km in 16 days. At the same ratio, how far would the student travel in 64 days?
April 26, 2013

Math
A gardener is installing a circular garden. The radius of the circle 28 feet. He needs to know the circumference in order to buy materials for the edging. What is the circumference if he uses = . The circumference is __ feet
April 25, 2013

Math
A lot is in the shape of a trapezoid. The sum of the bases is 180 feet. If the area of the lot is 8,100 square feet, what is the distance across the lot, i.e. the altitude of the figure? The altitude of the trapezoid is __ feet.
April 25, 2013

trignometry
If it helps the answer according to this ACT compass sample test questions print out is 6.93. How to solve it is the question ... C is a 90 degree angle. AB is 8 and the hypotenuse. AC is the base .... we don't know it's length. It's on page 14 if you google this...
April 24, 2013

chemistry
platinum metal currently costs $1700 per troy ounce ( note: this is different than a regular ounce 1 troy ounce =31.1035 g. what would the costs be, in dollars , to purchase enough platinum to form a solid cone with maximum radius 0.750 m ?
April 24, 2013

chemistry
A sample of copper metal containing 7.738*10^24 atoms is drawn into a cylindrical wire with radius r = 0.625 mm . How long must the wire be in meters?
April 24, 2013

Math
Compute the number of vinyl tiles, measuring 25 cm each side, needed to tile a kitchen measuring 102 ft. by 18 ft.
April 24, 2013

Math
Write 70,633.29 two other ways.
April 23, 2013

math
asdf
April 22, 2013

Chemistry
What [PB2+] should be maintained in Pb(NO3) to produce solubility of 1.0*10^-4 mol PbI2/L when PbI2 (s) is added? Ksp for PbI2 is 7.1*10^-9 I can't figure it out...
April 21, 2013

Science-Chemistry
Methyl amine is a weak base with a pKb=3.35. Consider the titration of 30.0mL of .030M of Methyl amine with 0.025M HCl. a) Write the appropriate equation for the reaction. b) Calculate K for the reaction in part (a). c) Calculate pH of the initial methyl amine solution (0mL ...
April 19, 2013

Physics
A singly charged positive ion has a mass of 2.74 10-26 kg. After being accelerated through a potential difference of 268 V, the ion enters a magnetic field of 0.450 T, in a direction perpendicular to the field. Calculate the radius of the ion's path in the field. cm
April 17, 2013

Math
Remy can chop 5 carrots in 3 minutes. How long will it take him to chop 120 carrots?
April 16, 2013

Algebra
simplify and write in standard form (2p^2-p)+(7p^4+P^3+2p)
April 15, 2013

Chemistry
What volume of H2(g), stored at 26°C at a pressure of 141 atm, would be needed to run an electric motor drawing a current of 8.4 A for 4.8 h?
April 14, 2013

math
Marty walks to school 4 days each week. The walk talks 15 minutes. How much time does it take marty to walk to school & home each week. Is this correct? 15×4=60 it takes him an hour each week
April 14, 2013

Physics
An object that is 32 cm in front of a convex mirror has an image located 17 cm behind the mirror. How far behind the mirror is the image located when the object is 24 cm in front of the mirror?
April 11, 2013

Physics
An object is placed in front of a convex mirror with radius of curvature = 17 cm. The object's height is 3.5 cm and it is initially 25 cm in front of the mirror. Find the (a) location and (b) height of the image. Next the object moves closer to the mirror, so the object ...
April 11, 2013

Math
Kurt cut pizzas into wedges measuring 40 degrees. If each person eats one piece of pizza How many people could he feed with 2 pizzas
April 10, 2013

General Chemistry II
Also, not sure if I did this correctly: Compute the solubility in moles/ liter for each sample titrated. 2.3 g KHTar in water. 2.3/18= .128 S= (.128/0.05)= 2.56 moles/ liter Is this correct?
April 10, 2013

General Chemistry II
Why is the Ksp value larger for NaNO3 and KNO3 than water?
April 10, 2013

SS Please check answers
your not helping at all
April 8, 2013

Mathematics
System 5x+8y+6z=14 2x+5y+z=12 -3x+6y-12z=20
April 8, 2013

Math
pie chart
April 5, 2013

chemistry
3.61*10^-9
April 4, 2013

geometry
In the diagram, circle A is tangent to circle C, and segment BE is tangent to circle A. The radius of circle A is 11 meters and the radius of circle C is 8 meters. Find the area of triangle ABE to the nearest square meter.
April 4, 2013

math
What is the value of t in the solution to this systems of linear equations? 2s – 3t = –1 3s – 4t = 0 a)–5 b)3 c)-7/3 d)4
April 3, 2013

math
i got 8s-12t=-1 and 9s-12t=0 i don't get how you subtract this?
April 2, 2013

math
how do you subtract this?
April 2, 2013

math
What is the value of u in the following system of linear equations? 4u + 3v = –1 3u + 2v = 1 a) 5 b)-11/2 C)-7 d)19/3
April 2, 2013

math
Look at the revenue for videos rented (v) on a given day at two different video rental stores below r = 2v + 10 r = 1.6v + 18 After how many video rentals will the revenues of both stores be equal? a)25 b)45 c)70 d)20
April 2, 2013

Chemistry
Na2SO4 solution is slowly added to a solution which contains .10 M Ba (2+) and .1 M Pb(2+). which of the following statements descrives the result of the addition of Na2SO4
April 1, 2013

Math
the perimeter of a rectangular field is 140m. If the length is increased by 15m and breadth is decrease by 5m, the length will become 3 times the breadth. Find the length of breadth of the field.
March 28, 2013

math
the ages of a son and father are in the ratio 3:8. if the son is 35 years younger than his father. find their ages.
March 28, 2013

Chemistry
you're the best! thank you!!
March 24, 2013

Chemistry
The Ka of a monoprotic weak acid is 8.11 x 10 ^ -3. What is the percent ionization of a 0.125M solution of this acid?
March 24, 2013

Chemistry
Assuming complete dissociation, what is the pH of a 2.55 mg/L Ba(OH)2 solution?
March 23, 2013

Language Arts
Or C
March 19, 2013

Language Arts
Oh OK I was asking it for homework help and it was an abcd question. I'm thinking it might be D then
March 19, 2013

Language Arts
Help Ms. Sue! Please check if I'm correct on this question. * Which of the sentences below is the best option for a thesis statement? A.) An after-school program at the community center might involve classes, sports, and other activities in which children can take part. B...
March 19, 2013

Physics
A 50.0-kg box is resting on a horizontal floor. A force of 250 N directed at an angle of 20.7° below the horizontal is applied to the box. The coefficient of kinetic friction between the box and the surface is 0.300. What is the acceleration of the box?
March 19, 2013

Science (physics)
A particle P is launched from a point O with an initial velocity of 60m/s at an angle of 30 degrees to the horizontal. At the same time, a second particle Q is projected in the opposite direction with initial speed of 50m/s from a point level with point O and 100m from O. You ...
March 18, 2013

Algebra
3 real numbers that form a geometric progression have sum equal to 175 and product equal to 17576. What is the sum of the largest and smallest numbers?
March 18, 2013

Trigonometry
I think I did use the sine law but I am just not sure how to get a+b?
March 18, 2013

Trigonometry
I calculated it and a got a totally different answer
March 18, 2013

Trigonometry
Let N be a 5-digit palindrome. The probability that N is divisible by 4 can be expressed as \frac{a}{b}, where a and b are coprime positive integers. What is the value of a+b?
March 18, 2013

Chemistry
I keep getting 5.17 pH. but thats wrong. do I use the equilibrium values to plug into the equation?
March 18, 2013

Chemistry
Calculate the pH at the equivalence point for the titration of 0.130M methalamine (CH3NH2) with 0.13M Hcl. The Kb of methyl amine is 5.0x10-4.
March 18, 2013

Education
1. in a study examining preschoolers' responses to their peers distress, researchers used ___ to record each instance in which a child cried, followed by other children's reactions. a. time sampling b. systematic collection c. event sampling d. structured observation 2...
March 14, 2013

Math
If someone is attached to a 20 ft rope, which is attached to the corner of a building, how far can they move? If the bulding is 22 ft X 15 ft?
March 14, 2013

inequality
find the solution to the following inequality 2(2x-6)>x+3, then graph the solution.
March 14, 2013

College Chemistry
A temperature of 20o C is equivalent to approximately
March 13, 2013

Math
A field trip costs $8.50 per student. If 125 students are going on the trip and a total of $1011.50 has already been collected, how many students have not paid yet?
March 12, 2013

chemistry
it's octahedral: (ep) F - - F As F - - F Cl
March 12, 2013

chemistry
it is lower
March 12, 2013

calculus
Suppose f satisfies the differential equation dy/dx=y+1 and f(0)=1. In other words, f′(x)=f(x)+1 and f(0)=1. Use Euler's method with a step size of 0.5 to approximate f(1.5).
March 12, 2013

calculus
Consider the interval I=[6,7.6]. Break I into four subintervals of length 0.4, namely the four subintervals [6,6.4],[6.4,6.8],[6.8,7.2],[7.2,7.6]. Suppose that f(6)=19, f′(6)=0, f′(6.4)=−0.5, f′(6.8)=−0.1, and f′(7.2)=−0.1. What is the...
March 12, 2013

Calculus
Consider the ellipse plotted by x^2+9y^2=9. Find the y-coordinate of the point on the ellipse that is farthest from the point (0,1). Your answer should be expressed as a fraction of whole numbers.
March 12, 2013

math
A 2 feet piece of wire is cut into two pieces and once piece is bent into a square and the other is bent into an equilateral triangle. How much wire should be used for the square to ensure that the total area enclosed by both shapes is minimized?
March 12, 2013

Math
Write the following number in standard form (4X10 4th power)+(3X10 3rd power)+(2X10 2nd power)+(5X1)=
March 5, 2013

Chemistry
in an experiment, ammonia gas, NH3(g) was bubbled through distilled water. Some of the dissolved ammonia gas, NH3, reacted with the water to form the aqueous ammonia ions, NH4. When red litmus paper was placed in contact with the aqueous solution, the paper turned blue. This ...
March 4, 2013

Physics
Find the electric field between the plates of a capacitor given the following: (1) C= 10pF (2) the capacitor is connected to a 25 V battery (3) there is a vacuum between the capacitor plates (4) plate separation is 2 mm
March 3, 2013

Chemistry
45
March 1, 2013

calculus
F(x)= ln((3x+6)^4 (x^3 -2)^5 ) F'(x)=
February 28, 2013

Language Arts
I took the quiz and it the answer is "Bleach is a poison"
February 28, 2013

Philosophy
First, translate the following statement pair into the symbols of propositional logic (use the letters P and R) (a) We will have a picnic unless it happens to rain (b) We won’t have a picnic only if it happens to rain Second, use truth tables to classify the above ...
February 28, 2013

chemistry
Calculate the theoretical yield (g) of precipitate formed when 10.0 mL of 0.50 M magnesium nitrate is added to 5.0 mL of 0.50 M potassium phosphate? [You must first write the balanced chemical equation.] Which reactant is present in excess?
February 26, 2013

Algebra
Ellen is 11 years older than Maja. Last year Ellen was twice as old as Maja. How old is Maja now?
February 25, 2013

Physics
A child throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. The ball leaves her hand 1.00 m above the ground. What is the magnitude of the ball's velocity just before it hits the ground?
February 24, 2013

Chemistry
The \rm p \it K_{\rm a} of this reaction is 4.2. In a 0.74\it M solution of benzoic acid, what percentage of the molecules are ionized?
February 21, 2013

geometry
in triangle lmn altitude lk is 12cm long through point j of lk is a line drawn parallel to ms, dividing the triangle into two region with equal areas find lj
February 20, 2013

Chemistry
1) Frank and Oswalt report a molar absorptivity of 4700 L mol^-1 cm^-1 for thiocyanatoiron(lll) ion. What absorbance would you expect for a soloution that it 1.0e-4 M in thiocyanatorion(lll) ion, if the path length is 1.00 cm? 2) At a given temperature, the equilibrium ...
February 19, 2013

Chemistry
2 SO2 (g)+O2 (g)→2 SO3­↑ How many grams of SO3(g) are formed if 8.45 grams of oxygen are used?
February 18, 2013

programming
I need to figure this problem out, I am using visual studio C#. • Powers - Write an application that displays a tables of squares and cubes of an integer from 1 to an upper limit. The user should enter the upper limit and press the calculate button. The application should...
February 17, 2013

Physics
120
February 16, 2013

Physics 2 with calculus
The wires leading to and from a 0.12--diameter lightbulb filament are 1.5 in diameter. The wire to the filament carries a current with a current density of 4.0×105 . what is the current density in the filament?
February 15, 2013

Math
Write the word form for 450, 708 Is it four hundred and fifty thousand, seven hundred and eight
February 14, 2013

physics
A 50.0-kg box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.5 m/s and that it stops in 2.5 s with uniform acceleration. What magnitude force does friction ...
February 14, 2013

Trig/precalc
Cos[x + (7 Pi)/4] + Cos[x - (7 Pi)/4] = 1
February 12, 2013

Calculus
ok thank you
February 11, 2013

Calculus
Find the derivatives of the function k(x)=sqrt(sin(2x))^3 I think I have the answer and was wondering if i had it correct k'(x)=2sin(x)^3+8sin(x)
February 11, 2013

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