# Posts by jr

Total # Posts: 128

**Science**

An aluminium cube measures 10 cm on each side. The density of aluminium is 2.7g/cmÃ¢â‚¬â€œÃ‚Â³. What is the cube's mass? I need help regarding the formula.

**Math**

Idk

**chem**

Assuming that all of the carbon dioxide ends up in the balloon, what will be the volume of the balloon at a temperature of 20 ?C and a pressure of 734 mmHg ?

**Physics**

I drop an object from a height of 500.0 m. How long does it take to hit the ground?

**Algebra 1**

Hudson is already 40 miles away form home on his drive back to college. He is driving 65 mi/h. Write an equation that models the total distance d traveled after h hours.

**Physics**

An object moves a to b, 4kms due west and then moves from b to c, 3kms due north. Find the displacement

**math**

Didn't help

**DIFF CALCULUS**

A swimming pool is 12 meters long, 6 meters wide, 1 meter deep at the shallow end, and 3 meters deep at the deep end. Water is being pumped into the pool at ¼ cubic meter per minute, and there is 1 meter of water at the deep end. a. What percent of the pool is filled? ...

**statistics**

Here is the entire problem I am working on. The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small Too Large Total Low Income 19 21 40 High Income 22 13 35 Total 41 34 75 Based on this data: (give your ...

**statistics**

The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small Too Large Total Low Income 19 21 40 High Income 22 13 35 Total 41 34 75 Q: If 100 children are chosen at random, it would be unusual if more ...

**Chemistry**

How many liters of nitrogen oxide at STP are produced from the reaction of 59.g of NH3? Balanced Equation: Ammonia reacts with oxygen to produce nitrogen oxide and water. 4NH3(g)+5O2(g)→4NO(g)+6H2O(g)

**Physics**

A hydrogen atom is at the earth's surface. The electron and proton in the atom are separated by a distance of 5.29x10^-11m. What is the ratio of the magnitude of the electrical force exerted by the proton on the electron to the weight of the electron?

**math**

Write an expression for the problem, then evaluate. Tickets for children in a carnival cost 150. A teacher of a class of 48 pupils gets for the whole class but only 43 pupils buy. Is it right for the teacher to say that she has 6,350 for the tickets of the children? Why

**math**

In a certain eatery, there are 5 glass racks having 24 glasses and 8 left over. The answer says there are 130 glasses in all. Is it right? Why?

**Chem**

Determine the volume of 0.250M KOH solution required to neutralize each of the following samples of sulfuric acid. 200mL of 0.135M H2SO4. I have gotten both 0.027 and 0.675. I thought it was mol/L. Please help!

**mth**

five pentagonal numbers that follow 22

**Physics**

An astronaut is at rest 1.0 m away from his shuttle when his jet malfunctions and his hand-held radio dies. unable to reach his shuttle to return to safety, a) what can the astronaut do to get himself back to his ship? b) Which of Newton's three laws would this demonstrate?

**Physics**

calculate the acceleration of this system, assuming that there are no frictional forces between the table and Block A. Block A is sitting on a table connected by a rope to a pulley system and Block B is hanging off the table connected to the rope from the pulley system. Mass ...

**budgeting and forecasting**

Paint Sales Time Series Week Sales (000’s of gallons) 1 6 2 8 3 10 4 9 5 11 6 12 7 10 8 8 9 7 10 9

**Math**

You could do 22 divided by 10=12

**differential calculus**

a pc of wire 10feet long is cut into 2 pcs. one piece is bent into the shape of a circle and the other into the shape of a square. how should the wire be cut so that the combined area is as large as possible?

**science**

2.77^-4 meters/second

**algebra**

is 5x + 2y = 8 look like horizontal, vertical, slanted right upwards,slanted right downwards?

**Teacher Aide**

Is that your answer DrBob222? Really!!

**Teacher Aide**

Which of the following factors contributes to the importance of teacher aides in schools today? a A decrease in the population b The decline of women in the workforce c The financial crisis in the school d Reduced teacher salaries

**math**

4888

**math**

oh 3 feet

**math**

1 foot

**math**

Anthony's older brother is 5 1/6 feet tall, Anthony's younger brother is 2 6/7 feet tall, about how much taller is Anthony's older brother than his younger brother. I got 2 feet?

**math**

thank you

**math**

1/4

**math**

While warming up for track meet,Anna jogged for 17/20 of a mile. Katie jogged for 3/5 of a mile. How much farther did anna jog?

**math**

2 8/12 + 7 9/12 = 9 17/12 that's where I get confused not sure how to break it down from here

**math**

6 28/20 - 2 15/20= 4 13 /20?

**math**

Zach is walking to his best friend's house, which is 5 1/3 blocks away, so far he has walked 2 5/6 blocks. How many more blocks does he need to walk?

**math**

wendy is making two different recipes for nut bread. One recipe call for 1/8 cup of nuts the other call for 3/4 cup of nuts. How many cups of nuts will wendy need in all?

**math**

Thank you Barb

**math**

7 2/5 - 2 3/4 = I need to show how I got the answer

**math**

4 5/8 + 9 3/5 = rename or simplify as needed

**Math**

rename or simplify as needed 11 1/4 - 5 8/9

**comparing fractions**

15/16 greater,less than or equal to 3/8

**math**

write the first five terms of a geometric sequence whose first term is 100 and whose third term is less than 30

**trig**

You lean a ladder 6.7 m long against a wall. It makes an angle of 63 degrees with the level ground. How high up is the top of the ladder?

**history**

the number of persons needed at a meeting in order for business to place is called

**us history**

1. income or money is called 2. a suggestion for a new law in congress is called 3. to make a change in the constitution is to make an 4. to help an enemy of your country is the crime of 5. a serious crime is known as

**english**

what is the definition of motivation from literature

**statistics**

A researcher is interested in estimating the average salary of teachers in a large urban school district. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050 (σ = 1050), how large of a sample is needed to be accurate within $200...

**MATH**

for 30 days on the 1st daY I GET A PENNY THAN ON IT DUOBLES EVERY DAY UNTIL DAY 30 HOW MUCH PENNIES DO I HAVE ON DAY30

**math**

23 divided by 6=3.83333333333 the 23 is my points and i divide it to find my gpa how do i round the answer

**math**

4(3) exponent is 2

**math**

23 divided by 6=3.83333333333 the 23 is my points and i divide it to find my gpa how do i round the answer

**math**

3x squared x=4

**math**

i know the square root of 36 is 6 but wat if their was a negative sign in side the square root box. Then one outside the box not inside and one on both places

**Math 6**

percent/100=13/20 multiply 13 and 100 then divide by 20

**Math**

The way you solve this problem is percent over whole and is over of 60%/100=250/x Cross multiply 100x250 the answer of that divide by 60 tell me if u need further help

**math**

How do u know wat way direction to put the inequality

**math**

The principal is choosing between 2 field tripS. The firt costs 600 dollars. The 2nd costs $240 plus $40 per students. For wat # of students is the 1trip less expensive?

**math**

square root of -64

**math**

JUSTIFIES A STEP IN THE SOLUTION OF AN EQUATION 4n+(7+n)=52 4n+(n+7)=52 (4n+n)+7=52 5n+7=52 5n+7-7=52 5n=45 5n/5=45/9 n=9

**matn**

JUSTIFIES A STEP IN THE SOLUTION OF AN EQUATION 4n+(7+n)=52 4n+(n+7)=52 (4n+n)+7=52 5n+7=52 5n+7-7=52 5n=45 5n/5=45/9 n=9

**algebra**

-1/2m > -7

**physics**

A 30lb sand bag falls off a hot air balloon floating stationary 5000ft above the ground what is the speed of the bag at the moment it hits the ground?

**math**

2-|2x-5|=0 explain

**math**

Yoga fun charges $63 starting war plus $12 per class. Yoga for all charges no starting fee and $15 per class. For how many classes will the cost be the sameat both places plz explain

**math**

5-(T-3)= -1+2(T-3)

**math**

-h-7= -13 explain on how to the variable while theirs a negative in front of it

**Intermediate Algebra**

im actually not sure on any of it. And when i tried to rework the problem to see how u got ur answer like y=13. Am i suppose to combine all the terms and then do the math?

**algebra**

Would the answer here be 8x^2+4x?

**algebra**

multiply (-x-1)(-4x^2-2x+2)

**algebra**

use polynomial long division to divide 4x^3+6x^2+16x-10 by -x^2-2x-5 help me please

**intermediate algebra**

joe has a collection of nickles and dimes that is worth $3.95. if the number of dimes was doubled and the number of nickles was increased by 21, the value of the coins would be $8.40. How many nickles and dimes does he have? show all your work. help me please

**PHYSICS**

At 25 m from a sound source, the intensity level is 55 dB. What's the level at distance of 56m? What's the level at distance of 273m?

**physics**

Find the distance by which a 43cm diameter, 8.7m tall concrete column is compressed when it supports a 12400kg load

**algebra 1**

hey jimmy was that all you got i seen 5 years old say better things then that

**algebra 1**

what is the degree of the trinomial? a3+7ab-8b4

**math**

If jim and john saved money in the ratio of 8:12,how much did john save if together they saved $400?

**java programming**

Create a program that will generate lottery numbers for the user. There are two types of numbers in the lottery, the standard numbers 1-43 and the power ball number 1-60.There are three different lottery games, a three number game, a five number game with a power ball, and a ...

**chemistry**

A gas occupies 10 liters at a pressure of 40.0 mm hg. What is the volume when the pressure is increased to 60.0 mm hg

**chemistry this is confusing to me please help**

1. heart rate temperature weight

**statistics**

Lorraine was in a hurry when she computed a confidence interval for μ. Because σ was not known, she used a Student's t distribution. However, she accidentally used degrees of freedom n instead of n - 1. Will her confidence interval be longer or shorter than one ...

**statistics**

True or false? Every random sample of the same size from a given population will produce exactly the same confidence interval for μ.

**statistics**

What are the values of the mean and standard deviation of a standard normal distribution? μ = σ =

**Statistics**

When a distribution is mound-shaped symmetrical, what is the general relationship among the values of the mean, median, and mode?

**math**

jbjj

**math**

A 1000·kg car traveling with a velocity of 13·m/s north collides head-on with a 2000·kg truck traveling with a velocity of 17·m/s south. Immediately after the collision, the velocity of the car is 11·m/s south. Taking north as the positive ...

**MATH**

Suppose the mass of ball F is 0.5·kg. What is the impulse delivered to the ball by the floor? Ball going south at velocity 4 m/s, hits floor and returns north velocity at 1 m/s

**physics**

Suppose the mass of ball F is 0.5·kg. What is the impulse delivered to the ball by the floor? Ball going south at velocity 4 m/s, hits floor and returns north velocity at 1 m/s

**Math**

describe the pattern you could use to complete the following grid, and then complete it. 0.22 __ __ __ 0.84

**math**

find the vertex, the line of symmetry, the max or min value of f(x)=2x^2-8x+16

**physics**

Three identical stars of mass M = 6.4 x 1030 kg form an equilateral triangle that rotates around the triangle's center as the stars move in a common circle about that center. The triangle has edge length L = 5.0 x 1010 m. What is the speed of the stars?

**physics**

Zero, a hypothetical planet, has a mass of 5.7 x 1023 kg, a radius of 2.8 x 106 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an initial kinetic energy of 5.0 x 107 J, what will be its kinetic energy ...

**physics**

In a long jump, an athlete leaves the ground with an initial angular momentum that tends to rotate his body forward, threatening to ruin his landing. To counter this tendency, he rotates his outstretched arms to "take up" the angular momentum. In 0.393 s, one arm ...

**physics**

A uniform spherical shell of mass M = 8.00 kg and radius R = 0.550 m can rotate about a vertical axis on frictionless bearings. A massless cord passes around the equator of the shell, over a pulley of rotational inertia I = 0.130 kg·m2 and radius r = 0.140 m, and is ...

**physics**

Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 120 ð rad/s. One such flywheel is a solid, uniform cylinder with a mass of 270 kg and a radius of 1.10 m. (a) What is the kinetic energy of ...

**Calculus**

a rifle aimed horizontally and 5 feet above level ground fires a bullet with a muzzle velocity of 3000 ft/sec. How far does the bullet travel from the end of the muzzle before it strikes the ground? (Ignore air resistance)

**Calculus**

a rifle aimed horizontally and 5 feet above level ground fires a bullet with a muzzle velocity of 3000 ft/sec. How far does the bullet travel from the end of the muzzle before it strikes the ground? (Ignore air resistance)

**physics**

An 82 kg man lowers himself to the ground from a height of 6.6 m by holding onto a rope that runs over a frictionless pulley to a 66 kg sandbag. With what speed does the man hit the ground if he started from rest?

**physics**

Figure shows an overhead view of a 0.026 kg lemon half and two of the three horizontal forces that act on it as it is on a frictionless table. Force F1 has a magnitude of 4 N and is at ¥è1 = 27¢ª. Force F2 has a magnitude of 6 N and is at ¥è2 = ...

**physics**

A 200-m-wide river flows due east at a uniform speed of 4.9 m/s. A boat with a speed of 9.0 m/s relative to the water leaves the south bank pointed in a direction 33o west of north. What is the (a) magnitude and (b) direction of the boat's velocity relative to the ground? ...

**math**

How long is the side of a square picture that can fit inside a circular picture frame that has a diameter of 8 inches? Hint: Pythagorean Theorem