# Posts by Joe

Total # Posts: 2,598

**chemistry**

What is the density of a cube that has a mass of 134 g and the side of the cube measures 2.75

*August 21, 2013*

**math**

Members of the West High School Band were hard at work practicing for the annual Homecoming Parade. First, they tried marching in rows of 12, but himself to bring up the rear left Andrew. Then the director told the band members to march in columns of eight, but Andrew was ...

*August 21, 2013*

**marketing**

Michael Soles--owner of Soles Shoe Store--recently discovered that shoe stores in his trading area have an average markup of 40%. Upon investigation, Michael found that his average markup is $15 on shoes that he sells for $45. This suggests that:

*August 11, 2013*

**math**

from a standard 52 card deck, how many 7 card hands have exactly 5 spades and 2 hearts?

*July 31, 2013*

**math**

From a standard 52 card deck, how many 5 card hands will have 2 clubs and 3 hearts?

*July 31, 2013*

**Physics**

IF YOU ADD THEM ALL UP AND DIVIDE BY 69 UR ANSWER IS STILL WRONG LOL

*July 25, 2013*

**chem**

The speed of your ship in still water is 20 knots.Your ship traveled 70 miles downward in channel in the same amount of time it traveled 45 miles upward the channel.Calculate the rate of the channel current.

*July 22, 2013*

**Math**

Define a variable, and write an equation. If x is the number of candy bars that Jason started with, x - (1/3)x - 3 = (11/30)x is an equation that can be solved to find the solution.

*July 21, 2013*

**algebra**

Difference of two squares: Example: x^2 - 9 factors to (x+3)(x-3) Perfect squares: x^2 + 6x + 9 = (x+3)(x+3) x^2 -6x + 9 = (x-3)(x-3) Cubes: x^3 - 27 factors to (x-3)(x^2 +3x +9) x^3 + 27 factors to (x+3)(x^2 -3x +9) Can you see the pattern?

*July 2, 2013*

**Statistics**

This is definitly an error because Ho was rejected when it was true. Google Type I and Type II errors and you will find the definition of each and then you will be able to figure out which error happened here.

*July 2, 2013*

**Math**

To find the range, substitute the values from the domain. Example: y = -3x + 4 y = -3(-3) + 4 = 9 + 4 = 13 y = -3(-2) + 4 = 6 + 4 = 10 So, we are finding the range of 13 and 10 s0 far

*July 2, 2013*

**Statistics**

You want to use a two-tailed t-test. You do not want to use matched pairs. books set things up differently, but here is one way to do it.. group 1 = dog owners group 2 = no dog Ho: mu1 - mu2 = 0 Ha: mu1 - mu2 does not = 0 If you are allowed to use a statistics calculator (like...

*July 2, 2013*

**math compound interest**

Suppose you put in a savings account at an APR of 6% compounded monthly. Fill in the table below rounding your answers to the nearest cent. (Calculate the interest and compound it by hand each month rather than using the compound interest formula.)

*July 1, 2013*

**Trignometry**

use the law of cosines to start and find side c. Then use the law of sines to find remaining angles.

*June 30, 2013*

**physics**

A 3 N weight slides down a ramp made of sandpaper. The coefficient of friction is 0.8, and the ramp is at an angle of 50° to the horizontal. How could you calculate the magnitude of the friction force? A. 3 N × sin(50°) B. 3 N × 0.8 × 50° C. 3 N &...

*June 27, 2013*

**Calculus**

a = 14, b = 21

*June 20, 2013*

**Math 6th Grade Level**

If he used 100 bags of the flour, this means he used 1/2 of the flour (100 is 1/2 of 200). So, 1/2 of 680000 is 340000 oz that were left. Therefore, he had 340000/5000 bags (you can do the math).

*June 19, 2013*

**pre-cal**

The 3-point line in basketball is 23 ft 9 in away from the point on the floor vertically below the center of an 18-in diameter rim. The rim is 10 ft above the floor. Kim shoots a three pointer using a 9-in diameter ball from the 3-point line that just clears the basket. The ...

*June 19, 2013*

**math**

-23/21

*June 17, 2013*

**Math for Educators**

The first ones are correct. Does it matter what base your solution is for the last one?

*June 17, 2013*

**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*

**Government**

coaliation

*June 15, 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*

**Finance**

0.98

*June 4, 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*

**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*

**math**

I cant really trust you i need more profe

*April 17, 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 that's 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*