# Posts by Bart

Total # Posts: 131

**Chemistry**

In a constant-pressure calorimeter, 65.0 mL of 0.320 M Ba(OH)2 was added to 65.0 mL of 0.640 M HCl. The reaction caused the temperature of the solution to rise from 21.98 °C to 26.34 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4....

**Chemistry**

A hot lump of 25.6 g of aluminum at an initial temperature of 57.4 °C is placed in 50.0 mL of H2O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final temperature of the aluminum and water given that the specific heat of aluminum is 0.903 J...

**english**

The answer is B. Although it may seem the other answers are correct as well, in fact they are not. A 'complex paragraph' is indeed one which explains multiple sides of an issue, but favors one, thus only one main topic is represented. It doesn't really matter where...

**Math**

a skateboard with a mass of 1.5 kg moves up a quarter pipe to a height of 5.0 meters. How fast was it moving at ground level?

**Physics**

A villain is knocked out of a low-flying aircraft by a heroic scientist-adventurer at an altitude of 370 m. After falling for 120 m the villain reaches terminal velocity. 7.16 seconds after reaching terminal velocity, the villain crash lands in a river full of piranha. If the ...

**Physics**

A spring (k=302 N/m) placed vertically on a surface has a 548 g ball placed on top of it. How far must the spring be compressed in order for the ball to be traveling at a speed of 2.8 m/s when it is located 438 cm above its initial position?

**math**

jay corp. bought machine for 15000. machine is expected to produce 10000 units. machine has residual value of 5000. assuming machine produces 400 units during year 1.what should depreciation expense be

**Physics**

Please other Problem 1 & 2!

**science**

why should nucleotides be in proper sequence during protein synthesis?

**Pre-Alegebra**

You spin a spinner that is divided into 6 equals parts once and roll the number cube once. Find the probability that the spinner stops on the same number that you roll the number cube?

**Algebra 2**

Two days ago "Steve" helped me with this problem. I am grateful to him. I didn't get it and asked for him to help me again. He showed it to me again, but I needed more steps shown. Then I think he was finished for tutoring for the day before I could see it again ...

**Algebra 2**

Steve, thank you for showing me again. Yes, I couldn't quite get it last time. I understood factoring out the 1/3 on the left side. I understood factoring the denominator on the right side. After that I have trouble. Could you please show it to me again with more steps in ...

**Algebra 2**

I know the answer to this question is: -1. I got that answer by substituting -1 in for x. Please show me how I should do this the correct way. (x/(3x+6))-((x+1)/(3x-6))=(1/((x^2)-4)) Thank you.

**Algebra 2**

Thank you for your help. I still need some more explaining. I understand factoring out the 1/3 on the left hand side. I also understand factoring the denominator on the right hand side. After that I have trouble. Could you please show it to me again, but this time with more ...

**Algebra 2**

I know the answer to this problem is -1. I found that by substituting for x and seeing if it worked. How should I do it the correct way? (x/(3x+6))-(x+1/3x-6)=(1/(x^2)-4)

**Physics**

Thank you!

**Physics**

You slide your friend with a mass of 65 kg out of the way as they are blocking the exit and keeping you from escaping from physics class where you have been tormented by problems for the last hour and a half. The coefficient of kinetic friction between the floor and your ...

**Algebra 2**

Thank you!

**Algebra 2**

When dealing with imaginary and complex numbers, are there 2 solutions? I.e.: x^2=4 x=2,-2 For: x^2=-4 x=2i or -2i ? (Is there a 2i and -2i, like for real numbers?)

**Algebra 2**

I tried to but I could not get it. Please help me.

**Algebra 2**

(2v-7)^(1/2)=v-3

**Algebra 2**

Thank you!

**Algebra 2**

(1/(n^2))+(1/n)=(1/(2(n^2)))

**Algebra 2**

Thank you!

**Algebra 2**

(18-n)^(1/2)=(n/8)^(1/2)

**Algebra 2**

Thank you!

**Algebra 2**

(20-r)^(1/2)= r

**Science**

What is the volume of a rectangle, H= 25 m, L= 100 m, W= 45 m.

**Science**

What is the volume of a rectangle, H= 25 m, L= 100 m, W= 45 m.

**Science**

What is the volume of a rectangle, H= 25 m, L= 100 m, W= 45 m.

**physics**

I do not understand the answer that was given to me on a post dated Nov. 23. Please help explain my questions that appear at the end of this post. Bart ------------------- Posted by Bart on Wednesday, November 23, 2011 at 6:52am. A baseball is hit with a speed of 27 meters per...

**physics**

For #2 What formula did you use when writing: (Vo^g)sin (2A)? Where did the 2 in the 2A come from? For #1 Where did the 27/sqrt2 come from? For #3 I still need help doing this one. I am not yet at the point where I can do it myself.

**physics**

A baseball is hit with a speed of 27 meters per second at an angle of 45 degrees. It lands on the flat roof of a 13 meter tall building. If the ball was hit when it was 1 meter above the ground, what horizontal distance does it travel before it lands on the building? A long ...

**Physics**

Convex Mirror

**math probability**

A man is camping. He has packed 8 black socks, 8 blue socks, 8 white socks, and 8 gray socks. It is still dark when he gets dressed. How many socks would he have to pull out of his bag to BE SURE that he has a matching pair?

**L.arts**

the book says Ponyboy,Dally, and Johny saved the kids in the hall way when they were in the church is that true? because in the movie they didn't

**Chemistry**

6.9

**Geometry**

A concrete pad has dimensions 9 ft by 9 ft by 4 inches. How many cubic yards of concrete does it contain?

**bibb**

Consider a rider on a Ferris wheel which is turning at constant speed. (a) At what point is the upward component of the force of the seat on the rider minimum? (b) At what point is the upward component of the force of the seat on the rider maximum? Justify your answers.

**Algebra 1**

I do not understand how to figure out probability. Lee has an urn with 8 white marbles and 10 black marbles. A marble is drawn at random and not replaced. Then a second marble is drawn randomly. What is the probability that the first is white and the second is black?

**Algebra 1**

I do not understand how to figure out probability. Lee has an urn with 8 white marbles and 10 black marbles. A marble is drawn at random and not replaced. Then a second marble is drawn randomly. What is the probability that the first is white and the second is black?

**Algebra**

I am to find the equation of the axis of symmetry and the coordinate of the vertex of the graph of each function. I don't undertand y=2x^2+4

**math**

a mountain, 100 feet above sea level, is near a valley 700 feet below sea level. How many feet higher is the mountain than the valley? 800 feet

**math**

thanks ms sue

**math**

a mountain, 200 feet above sea level, is near a valley 700 feet below sea level. How many feet higher is the mountain than the valley? 900 feet

**science**

ms sue i don't get what youre trying to say so a is not the answer then

**science**

the width of a door and the length of a baseball ball are about a ______ long. a)meter b)centimeter c) liter d) kilometer e) none of the above A

**science**

what is the standard SI unit for measuring mass? kilogram just need to know if that's the right answer or not.

**health**

What are some methods that are used to uncover basic emotions? Which one of these methods is the most effective? Why?

**adult education**

What are some methods that are used to uncover basic emotions? Which one of these methods is the most effective? Why?

**Geometry**

I am to find "d" (the hypotenuse)in the simplest radical form of a right triangle. The two angles are 30 degrees on top and the on the bottom is 60 degrees. Of course the opposite side to the left of 60 is 90 degrees. My options are: A) 8sqrt3 B) 4 C) 8sqrt2 D) 16 I ...

**Algebra: I don't understand**

If P(A) =7/36, P(B) =1/6, and P(A and B) = 0, what can you say about P(A or B)? Would the answer be 13/16? I am just guessing. I am assuming we have to find a commond denominator and then add?

**Statistics am I correct?**

Each of ten tickets is marked with a different number from 1 to 10 and put in a box. If you draw a ticket at random from the box, what is the probability that you will draw 2, 3, or 1? A) 1/2 B) 1/10 C) 1/3 D) 3/10 P=1/10 for 1 P=1/10 for 2 p=1/10 for 3 P=3/10

**Standard Deviation-Please check**

2-25.125=-23.125 = 534.77 5-25.125=-20.125 = 405.02 47-25.125=21.875 = 478.52 11-25.125=-14.125 = 199.52 13-25.125=-12.125 = 147.02 48-25.125=22.875 = 523.27 39-25.125=13.875 = 192.52 36-25.125=10.875 = 118.27 Sum 2598.41 If I divide by one less,which I am supposed to do I ...

**Standard Deviation-What?**

I cannot figure out how to do standard deviation. standard deviation 2, 5, 47, 11, 13, 48, 39, 36

**Probability-Please check**

Consider the experiment of rolling a single die. Find the probability of the event described. What is P(odd or prime? Since this is an "or" problem would the problem consist of 3 chances out of 6 thus my answer = 1/2?

**Algebra-Please check**

y = 2x^2 I am to decide if this is a linear, quadratic or exponential function. I chose that the above function is quadratic. Am I right?

**albebra**

I do not understand how to find x on a graph when there is no equation. I have the possible answers: a) x= -3, b) x=-1, c) x=5, d) x=1 It asks me to find the value of x when y is 5; however, the graph I have has a line (0,2) on the y axis and on the x axis it looks like it ...

**Algebra HELP:(**

I do not understand how to find x on a graph when there is no equation. I have the possible answers: a) x= -3, b) x=-1, c) x=5, d) x=1 It asks me to find the value of x when y=5

**Algebra HELP. is this correct**

so 36 is 6,6 so there are two solutions. Am I understanding this correctly

**Algebra HELP:(**

Use the discriminant to determine how many real-number solutions the equation has. 36x2 - 12x + 1 = 0 How do I do this?

**Algebra: pleace check**

find the other endpoint of a line segment with the given midpoint (6,4) endpoint ((3, 5). 6= 3/2 and 4 = 5/2 12=6 and 8 = 10 12-6 and 8 - (-10) End Point = (6, 18)

**question for Reiny**

Reiny, I know that my presentation is poor form. I only know how to work this in MS Word the right way. Is my answer supposed to d=sqrt 34 or d=5.83?

**algebra please check**

Find the distance between the given points (3, 5) and (8, 2) (8-3)^2 + (2-5)^2 5^2 + -3^2 25 + 9 = 34 sqrt of 34 = 5.83

**algebra please check :(**

find the midpoint of the line segment having the given endpoints(0,5) and (0, -8). (0+0/2, -8+5/2) = (0/2,-3/2)= (0,-1.5) P = (0, -1.5)

**Algebra: please check**

Find the equation of a line that passes through the point (1,2) and has a slope of 1/3. Show how you found the equation. Would the equation be: y-2=1/3(x-1) Do I need to finish this? I am not sure how.

**Algebra: ?**

Wouldn't the answer be y=.05x + -1-12

**Algebra: ?**

Wouldn't the answer be -1/12

**Algebra: ?**

Give the equation of a line that is perpendicular to the graph of each equation. I do not understand. y=12 Would I just write the opposite? y = -12

**algebra please check :(**

I would say that the lines are NOT parallel and are perpendicular. The y intercept for the first equation is 0, -5 and the second is 0 + 5

**algebra please check :(**

Are the lines parallel and how did I come to this conclusion? y + x = -5 and y - x = -5 first I it so y is by itself y = -x -5 second equation = y = x +5 Would the answer be yes? y= -5 and y = 5? Not sure I really understand thx.

**Algebra HELP :(**

If you write a check without enough money in the bank, a certain store will charge you a penalty if the check is returned to them from the bank. The penalty is 5% of the amount of the check plus a $10 processing fee. Let n= the amount of the check and p the amount of the ...

**Algebra: is this right?**

the amount of money remaining to be paid on a loan, y, is a function of the number of months, x. Suppose that monthly payments of $225 are to be made on an original loan amount of $3,000. Write an expression in terms of x that gives the amount of money remaining to be paid. $3...

**Algebra HELP:(**

The total cost of purchasing from a mailorder catalog, y, is a function of the cost of the items purchased, x. In addition there is a fixed shipping charge of 2.75 per order, and sales tax is 8%. Write an equation that shows the relationship between the quantities. I have ...

**geometry**

I need to find the area of the shaded portion of a circle with a square in the middle all corners touching the circle. My square has a line measurement of 10 cm. I know that the area of the square is 100 cm(10 x 10). But I am not sure what to do with the circle. Is the ...

**geometry**

I am not sure I understand especially the part where it says "the value". If the surface area of a sphere decreases, will the value of the volume remain the same? If we decrease the radius than we should have a different volume - right?

**Geometry :(**

Thank you for the reference. That was helpful.

**Math: Help: probability**

Which answer, if any, is correct to: Two cards are drawn without replacement from an ordinary deck of 52 playing cards. What are the odds against drawing a club and a diamond? My options are 13:204; 204:13, 13;191; or 191:13 I had two different people help me and here are the ...

**Exterior angle what am I doing wrong?**

Find the measure of the indicated exterior angle. Exterior angle is: 197-5n Two interior angles are: 5n+21 and n+11 I set it up as: 197-5n=5n+21+n+11 197-5n=6n+32 165=11n but this does not make sense.

**Help: three different answers**

I do not know what to do. I used the Venn diagram for myself but I think I was wrong as I got 4/7 as PsyDag did. I don't think 5/7 is correct as the problem doesn't say equal to or less than 10. I do not understand Adam's equation and solution. Could you please ...

**Math**

Assume that the weight loss for the first two months of a diet program has a uniform distrbiution over the interval 6 to 12 pounds. Find the probability that a person on this diet loses less than 10 pounds in the first two months. Not sure what to do. A) 1/6 B) 5/7 C) 1/3 D) 2/3

**Math**

The U.S. Department of Defense makes use of statistics in designing weapon systems for tanks and other forms of armor. By measuring the results of the firing of a weapons system under simulated combat conditions, ballistics researchers can estimate the accuracy of the shells ...

**Math: Still need help**

I need help understanding how to solve by going through step by step. I do not want to know the answer, I need to learn the process. Please help me through that.

**Math: i do not understand**

A tractor manufacturing company machines axles to extremely small tolerances. The main power axles have a mean diameter of 3.0000 inches and a standard deviation of 0.0050 inch. What is the probability that a given axle will have a diameter between 2.9915 and 3.0004 inches? ...

**Math: Is my answer correct?**

why do you only multiply to the third power?

**math**

Mode is the value that is used or repeated the most in a sequence of numbers.

**Math: please check**

There are 30 fish in a pond. We know that 13 of these fish are males, 4 of these males are salmon, and there are 8 salmon in the pond. What is the probability that a randomly chosen fish is a salmon, given that it is a male? I think they are just asking about salmon and trying...

**Math: please check**

Consider a bowl containing 36 different slips of paper. Ten of the slips of paper each contain one of 16) the digits from the set 0 through 9 and 26 slips each contain one of the 26 letters of the alphabet. If one slip is drawn at random, what is P(odd number or a consonant)? ...

**probability Please check answer**

A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability of choosing a marble that is not blue? 7 red marbles plus 1 green marble = 8/10 = answer = 4/5

**Math-Probability**

I do not know how to figure out his next shot. A basketball player has made 34 of her last 42 freethrow attempts. What probability would you assign to the player’s next free throw being successful? Explain your reasoning. 34/42 = 17/21 I would assume that that the ...

**Math probability**

How many ways can three cars be parked in a row of four parking spaces? I have no idea how to do this?

**Lost**

consider a bowl containing 36 different slips of paper. Ten of the slips of paper each contain one of the set of digits 0 through 9 and 26 slips each contain one of the 26 letters of the alphabet. Determine the probabilities of the events specified. Drawing one slip, what is P...

**Math Probability**

Does this mean that we do not count the two red fives as they would already be counted in the reds.

**Math Probability**

consider the experiment of selecting a card from an ordinary deck of 52 playing cards and determine the probability of the stated event. A red card or a card showing a 5 is drawn. There are 26 red cards and 2 extra fives. Would my answer be 28/52?

**Probability math ?**

If I am rolling a single dice what is the probability of rolling a number that is divisible by 2 and 3? The only number divisible by 2 and 3 is 6. So, would the answer be 1 out 6 or 1/6

**Math**

I think I confused myself. I do not want to calculate range but variance. In order to get the variance what do I do?

**Math**

I think, but how about this: calculate range: -1, 0, 1, 0, -1, 0, 1, 0, -1, 0, 1, 0 is it: 1, 0, 1, 0, 1, 0 , 1, 0, 1, 0, 1, 0: but how do you do the rest if this is right?

**Math**

I do not understand how to figure this out: Calculate variance:

**math Did I do it right?**

Thank you

**Ms. Sue**

Right it was subtraction. So what does "without adjustment" mean?