# Posts by kelly

Total # Posts: 1,759

**math**

60%

**chemistry**

which is more endothermic in water, ammonium chloride or potassium nitrate

**Math**

If a road passes through R(4,-11) and S (0, -9) and another road passes through J (6,-2) and K(4, -5) and are straight lines, are the two roads perpendicular and why?

**math**

(parent). My son's problem says "the product of a number and 17"...supposed to write as expression... I'm thinking it would be a 17x=y but he's adamant that because the word "and" is in the sentence that he needs to add something as well.... (no...

**math**

use the properties of logarthms to find the exact value of the each expression lower 7loglower 76

**statistics**

At a large dept. store, the avg. number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years. If the number of years of employment at this department store is normally distributed, what is the probability that a cashier selected at random has ...

**statistics**

A food snack manu. samples 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is .15, find the 95% confidence interval estimate for the true mean.

**science**

A normal man and a heterozygous color blind "carrier" woman have a baby. If they have a girl, what is the probability that the girl will be colorblind. If they have a boy, what is the probability that the boy will be colorblind?

**psychology**

Marla is talking to a friend and spreading a rumor that she heard about a co-worker. When the friend asks where she heard the rumor, Marla cannot remember. Marla is experiencing what psychologists call 1)retrograde amnesia. 2)anterograde amnesia. 3)source amnesia. 4)stress ...

**psychology**

Recent neuroimaging research indicates that people with OCD show increased levels of grey matter in the _____ and the _____ relative to those who do not have OCD. 1)splenium; corpus collosum 2)locus ceruleus; hypothalamus 3)thalamus; left frontal cortex 4)thalamus; right ...

**Physics**

a mouse pushes a piece of cheese with a mass of 6.4 g for a distance of 75 cm over the frictionless surface of an air hockey table. He exerts a constant 0.5 N force as he does so. If the cheese starts from rest, what is it's final velocity?

**Physics**

three bugs that are connected by a mass less spider silk are pulled along a frictionless table top. The first bug has a mass of 1.5 g, the second, 2.0 g, and the third, .75 g. The spider pulling them exerts a force of 0.011 N. What is the acceleration of each bug?

**chemistry**

need to convert 5.26g/cm3 to m3

**science**

Mendel realized that the principles of probability could be used to _______ the results of genetic crosses. What's the blank? please help! thanks a bunch!

**physics**

A 1500kg car is approaching the hill shown in the figure at 15.0 m/s when it suddenly runs out of gas. Part A What is the car's speed after coasting down the other side?

**physics**

a 1100 kg wrecking ball hangs from a16m long cable. the ball is pulled back until the cable makes an angle of 17 with the vertical. By how much has the gravitational potential energy of the ball changed?

**hum 101**

What are some examples of a situation that the strateigies used in "The Art of The War by Sun Tzu be applied to?

**chemistry**

44.5

**4th grade math**

What is 15,454 rounded to the nearest thousand?

**Chemistry**

Iron (III) hydroxide is soluble in acid: Fe(OH)3(s)3H^+(aq)-->Fe^3^+(aq)+3H2O(l) a. How many milliliters of 1.00 M HCl are needed to dissolve 1.00 g of iron (III) hydroxide? b. If you added enough HCl to dissolve the 1.00 g of iron (III) hydroxide and then diluted the ...

**Physics**

A 11.0-g bullet is fired horizontally into a 101-g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 160 N/m. The bullet becomes embedded in the block. If the bullet-block system compresses the spring ...

**chemistry**

_A2(SO3)3+_NaOH->_Na2SO3+_Al(OH)3 if you start with 389.4 g of Al2(SO3)3 and you produce 212.4 g of Na2SO3, what is your percent yield for this reaction?

**chemistry**

_H3PO4+_KOH->_K3PO4+_H2O if 49.0 g of H3PO4 is reacted with excess KOH, determind the percent yield of K3PO4 if you produce 49.0 g of K3PO4.

**chemistry**

1K2PtCl4+2(NH3)->1Pt(NH3)2Cl2+2KCl what is the percent yield, when 34.5 grams of NH3 react with excess K2PtCl4 if 76.4 g of Pt(NH3)2Cl2 are actually produced?

**Calculus**

what happens to the 2 in e^2x? do u bring it down?

**Calculus**

Find the solutions of the exponential equation e^2x–4e^x+3=0 x1=? x2=?

**physics**

While fishing, you get bored and start to swing a sinker weight around in a circle below you on a 0.31- piece of fishing line. The weight makes a complete circle every 0.70 . What is the angle that the fishing line makes with the vertical? Express your answer using two ...

**Chemistry**

a 9.85 g sample of an unknown metal M is burned in the presence of excess oxygen, producing the oxide M2O3 (s) and liberating 57.8kJ of heat at constant pressure. What is the identity of the metal? 4M(s) + 3O2(g) yields 2M2O3(s)

**Calculus**

Let f(x) = 1/(x+2) and g(x)= (x-1)/x. Simplify and state the domain. f(g(x)) g(f(x))

**Poem Help**

so the correct answers for this quick check, which I just took, are: 1. b 2. c 3. a 4. d

**Poem Help**

4 is d

**calculus**

lim (x^(2)-4)/(x-2) x->2 lim x->1 (x+1)/(x-1)

**Chemistry**

Running at a rate of 6 mi/h uses 704 Calories in an hour. Convert this value to (a) calories; (b) kilocalories; (c) joules; (d) kilojoules.

**math**

The products of 5x4 (20) and 1x4 (4)added together (20+4=24)is one half the product of 6x8 (48). If you double the sum of 20+4 (24) you will get 48 (24+24=48 or 24x2+48).

**Programming Logic**

Shemrock Inc. is a brake pad manufacturing company. This company uses raw materials, such as carbon powder, iron, ash, and resin. It wants to develop an inventory management system that will have the following features: 1.The system should store the current inventory levels ...

**chemistry**

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, NH4Br, and aqueous lead(II) acetate, Pb(C2H3O2). Enter the balanced net ionic equation, including phases, for this reaction.

**chemistry**

A certain weak base has a Kb of 9.00 × 10-7. What concentration of this base will produce a pH of 10.34?

**lens surface**

A spherical generator is used to produce a -15.00D surface on glass of refractive index 1.80. The diameter of the cutting tool is 80mm and the radius of the cutting surface is 4mm. What is the angle between the axis of the tool and the axis of the lens? Do I calculate the ...

**Chemistry**

What is the concentration of Cu2+ in a solution that is 0.10 M Cu(NH3)4^2+? (Kf = 1.2 x 10^12) The answer is 8.0 x 10^-4 How do I solve the problem to get the answer

**physics**

If an automobile engine delivers 48.2 hp of power, how much time will it take for the engine to do 6.80 ✕ 105 J of work? (Hint: Note that one horsepower, 1 hp, is equal to 746 watts.)

**Physics**

A dockworker loading crates on a ship finds that a 22-kg crate, initially at rest on a horizontal surface, requires a 80-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant ...

**Physics**

A dockworker loading crates on a ship finds that a 22-kg crate, initially at rest on a horizontal surface, requires a 80-N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant ...

**Physics**

A crate of mass m = 31 kg rides on the bed of a truck attached by a cord to the back of the cab as in the figure. The cord can withstand a maximum tension of 82 N before breaking. Neglecting friction between the crate and truck bed, find the maximum acceleration the truck can ...

**physics**

Betty Bodycheck (mB = 51.4 kg, vB = 22.0 km/h in the positive x-direction) and Sally Slasher (mS = 42.4 kg, vS = 28.0 km/h in the positive y-direction) are both racing to get to a hockey puck. Immediately after the collision, Betty is heading in a direction that is 76.0° ...

**please help!**

I'm having trouble with this word problem. Two friends Jodi and Abe go horseback riding on the same trail in the same direction. Jodi's horse travels at 5 miles per hour while Abes horse travels at a slower pace. After 2 hours they are 2 miles apart. Find Abes horse ...

**math**

to estimate how many more people live in Atherton than Needles, which is closer to the exact answer: rounding to nearest hundreds or thousand

**Is this right?**

I have to determine the slope and y- intercept of this equation then graph 4x=6y+9 so I ended up putting it in y-mx+b form and it was 6y=4x+9 so slope is 4x and y intercept is 6y? How would I graph it though?

**math**

use the orden of operation and the digit 4 four time to write problems that have the following answers 44

**Math**

Expression for the square of one more than a number

**Math**

-8(t-3)-(t+1)=6

**Physics**

A baseball is hit so that it travels straight upward after being struck by the bat. A fan observes that it takes 3.20 s for the ball to reach its maximum height.

**Physics**

A ball is thrown vertically upward with a speed of 15.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...

**Physics**

In 1865, Jules Verne proposed sending men to the Moon by firing a space capsule from a 220-m-long cannon with final speed of 10.97 km/s. What would have been the unrealistically large acceleration experienced by the space travelers during their launch? (A human can stand an ...

**Physics**

A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 3.00 s. (a) Find the average acceleration of the plane. (b) Assuming the acceleration is constant, find the distance the plane moves.

**Physics**

The average person passes out at an acceleration of 7g (that is, seven times the gravitational acceleration on Earth). Suppose a car is designed to accelerate at this rate. How much time would be required for the car to accelerate from rest to 59.1 miles per hour?

**Physics**

A tortoise can run with a speed of 0.13 m/s, and a hare can run 20 times as fast. In a race, they both start at the same time, but the hare stops to rest for 4.0 minutes. The tortoise wins by a shell (35 cm). (a) How long does the race take? (b) What is the length of the race?

**Physics**

A motorist drives north for 40.0 minutes at 61.5 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 1.70 h. (a) What is his total displacement? (b) What is his average velocity?

**Math**

84

**health**

i think its B.

**Math**

1.d 2.a 3.c 4.b

**science**

I need helping locating information about the environment of Costa Rica so that I can analyze data about the country.

**HSM/270**

Last few weeks of class and struggling to keep up to graduate, can somebody help me if they have done this before, also i used the PEACE Program for my assignments in this Grant Proposal and Writing class. Thanks Identify where the program planning and evaluation process can ...

**english**

Was this answer correct?

**math**

What are the step to help solve for 5r+30/20= 3r-36/3

**math**

How to write the ration as a fraction in lowest terms. Compare in hours. 22 hours to 3 days. The ratio is __.

**math**

The distance between city A and city B is 500 miles. On a certain wall map, this is represented by a length of 2.3 feet. On the map, how many feet would there be between city C and city D, two cities that are actually 800 miles apart? On the map, city C and city D are ___ feet...

**math**

If 5 sweaters cost $39.40, how much would 8 sweaters cost? The cost is $__.

**math**

Write the ratio as a fraction in lowest terms. compare in inches. 3ft to 31 inches. The ratio is__.

**math**

The sum of the measures of the angles of any triangle is 180 degrees. In triangle abc, angles a and b have the same measure, while the measure of angle c is 78 degrees larger than each of a and b. What are the measures of the three angles? angle a is __degrees.

**math**

If planet I is 31.8 million miles from the sun than planet II, then planet III is 25.6 million miles father from the sun than planet I. When the total of the distances for these three planets from the sun is 200.2 million miles, how far away from the sun is planet II? Planet ...

**math**

An electrician cuts a 26ft piece of wire into two pieces. One piece is 4ft longer than the other. How long are the pieces? What is the length of the shorter piece?__ft

**Comunication Skills**

Cultural history.

**Math**

Evaulate each expression: (-1/8)^1/3 Would you make it 3 square root of -1/8? I don't know how to go from there. (256/81)^1/4 Same thing, would it become 4 square root (256/81)?

**Math**

Factor out the common factor: −3x^4 y^2 + 18xy^3 + 9xy^4

**Math**

Factor the trinomial: 2x^2 +11x - 63

**ENGLISH**

yup! all were right! thanks so much!!:)

**Algebra**

The first two please

**Algebra**

please help me solve my homework with all the work involved. i have trouble paying attention in class so it's hard for me to do my homework. here are a few of the questions. I need to find out what the letters equal. 1.) 10(-4+y)=2y 2.)9(b-4)-7b=5(3b-2) 3.)-(8n-2)=3+10(1-...

**Math.**

A spinner is divided into 8 equal sections. There are 3 yellow sections and 5 green sections. The spinner is spun 32 times. Which proportion can be used to find the number of times, B, that the spinner could be expected to land on a green section?

**English**

Opps I mean dedicate*

**English**

I am writing a paragraph about why I want to participate in this school counsil thing and I was wobderi if the word choice for "deticate" in this sentence makes sense: I want to deticate myself to participate in more school activities.

**English**

Is this sentence right? I have never had a pet before.

**Svience**

I'm just courious what "ragweed mix" is/are. Is it one type of plant or a bunch?

**history**

the construction of Levitt Towns

**stats 101**

how do you find the lower class limit,upper class limit, class width, class midpoint, and class boundaries from a set of frequencies data

**physics**

Two positive charges, each of magnitude 2 10-6 C, are located a distance of 17 cm from each other. (a) What is the magnitude of the force exerted on each charge?

**health and diseases**

Im not sure how to do it? I need suggestions

**health and diseases**

I need help on doing a powerpoint presentation about trichomoniasis

**Chemistry**

I am stuck on this question: what mass of KCl in grams when 2.00 lbs KC10 3 is decomposed?

**anth**

why is anthropology necessary in a career/life?

**abnornal psych**

so what are the necessary reason for and aganist establishing a specific disorder related to suicide?

**abnornal psych**

should suicide be added to the DSM IV- TR and what are the reason for and aganist establishing a specific disorder related to suicide?

**Math**

If y is directly proportional to x and inversely proportional to z^2, by what value is y multiplied if x is doubled and z is multiplied by 3

**physics**

You have a mass of 71 kg and are on a 51-degree slope hanging on to a cord with a breaking strength of 165 newtons. What must be the coefficient of static friction to 2 decimal places between you and the surface for you to be saved from the fire? In the previous problem if the...

**College physics**

A skier traveling at 30.9 m/s encounters a 21.5 degree slope. If you could ignore friction, to the nearest meter, how far up the hill does he go?

**Physics**

I'm still a little confused. When I use the equation: W = k(x2^2 - x1^2)/2, I get 0.0216 J. This doesn't seem correct.

**Physics**

A spring with k = 54 N/cm is initially stretched 1 cm from its equilibrium length. (a) How much more energy is needed to further stretch the spring to 2 cm beyond its equilibrium length? (b) From this new position, how much energy is needed to compress the spring to 2 cm ...

**Chemistry**

Calculate the final pressure on the addition of 2.0 g He(g) to a vessel of 10.0 L fixed volume already containing O2(g) at 25°C and 740 mm Hg

**Learning through Play**

One of the parents in your school says, “I really enjoyed coming to Parents’ Night last week and seeing all the things the children are doing. I was particularly interested in your comments about the materials which enhance cognitive abilities. Why is it so much ...

**Calc- Trig Substitution**

integral of dx/square root(x^2-64) My answer is: ln (x/8 + square root(x^2-64)/8) +c is this right?