# Posts by Karla

Total # Posts: 205

**CHE1**

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2(l) ? 2H2O(l) + O2(g) ?H = -196 kJ Calculate the value of q (kJ) in this exothermic reaction when 4.60 g of hydrogen peroxide decomposes at constant pressure?

**physics**

a store advertises carpet that costs $ 18.95 per square yard. how much does that carpet cost per square meter?

**math**

Alana picked p peaches. Michelle picked 18 times as many peaches as Alana. Write an expression that shows how many peaches Michelle picked.

**math**

Tucker bought 2 bags of beans. There are b beans in each bag. Write an expression that shows how many beans Tucker bought.

**Math Estimating products**

Which Benchmark Fraction could you use to estimate the product of 36 x 11/16 ? PLEASE HELP ME ANSWER IM STUCK IDK

**Math**

Mr. Hernandez asked his students to estimate the area of the circular garden in front of the school. If the radius of the garden is 7 feet, which statement is closest to the area of the garden

**math**

ratio 1/3

**Algebra**

Solve the given polynomial equation. Use the Rational Zero Theorem and? Descartes's Rule of Signs as an aid in obtaining the first root. 2 x cubed minus 5 x squared minus 5 x minus 1 equals 02x3?5x2?5x?1=0

**Math**

The point C(4 , -2 ) , D(2,1) and E(-1,-1) are translated onto C' and D' and E' by the vector <-1,4> find the coordinates of C' D' and E'

**English**

In Marigolds how does the author use of tone help describe Elizabeth's perception of her childhood? -her tone sounds solemn at first showing that she was reflecting over her sad or hard childhood. Then it switches to matter of fact because she realizes she did wrong and ...

**math**

11 increased by twice Vanessa's age

**Math**

Mr. Josie's investment decreased 25% in value. By what percent should its value increase so it can get back to its original value?

**Math**

Mandy runs 4 km in 18 minutes if she planes to run in a 15 km race how long will it take her to complete the race

**Chemistry-nudge the**

A 4.30 g nugget of pure gold absorbed 298 J of heat. The initial temperature was 22.0°C. What was the final temperature? °C

**Chemistry**

A 4.30 g nugget of pure gold absorbed 298 J of heat. The initial temperature was 22.0°C. What was the final temperature? °C

**Chemistry**

Assuming ideal behavior, determine the mole fraction of acetone in a solution of acetone and water if the vapor pressure of acetone changed from 750mmHg to 735mmHg.

**physics**

4500m 2.8miles

**Social Studies**

A. Warmer Ocean Temperatures

**math**

4.5ft

**Math**

Genrald and Michelle went on a 24-mile bike ride. They rode 1/4 of the distance before stopping. By lunchtime, they rode 5/8 of the total distance. How many miles did they have left to ride after lunch?

**math**

Greg has a dollar bill, quarters, and dimes. how many ways can he make $1.75?

**math**

grant pays $0.10 per minute plus $5 per month for telephone long distance write an algebraic expression for m minutes of long distance calls in one month

**math**

a slice of pizza has 290 calories to find out how many write an algebraic expression to find out how many calories there are in a slices of pizza and b stalks of celery

**math**

the Nile River is the longest river in the world that 4160 miles a group of explorers travel along the entire now in xx days they traveled the same distance each day write an algebraic expression to find out each day's distance

**math**

the types of mini food players as it is triple plays in band is there in flute players write an algebraic expression to find out how many trumpet players there are

**maths**

How many red beads would there be in a pattern with 78 blue beads?

**Math**

37.68 cm^3

**college chemistry**

When a solution containing 8.00 g NaOH in 50.0 g of water at 25 °C is added to a solution of 8.00 g of HCl in 250.0 g of water at 25 °C in a calorimeter, the temperature of the solution increases to 33.5 °C. Assuming that the specific heat heat of the solution is ...

**Algebra**

in what form is the following linear equation written? 3x-2y=4 A.rise-run B.standard C.slope-intercept D.point-slope

**math**

The greatest integer function ,shows below, is defined to be greatest________less than or equal to x. f(x)=[[x]]

**algebra 2**

f(x)={2x,x<1} {5,x=1} {x^2,x>1} Given the piecewise functions shown below, select all of the statements that are true. A.f(5)=1 B.f(2)=4 C.f(-2)=4 D.f(1)=5

**algebra2**

is f(x)= x^3-x^2-9x+9 a one to one function

**algebra2**

hoe many solutions are there to the equations below? 8x+47=8(x+5)

**algebra2**

how many solution are there to the equation below? 3x-10(x+2)=13-7x A.1 B.0 C.Infinitely many

**algebra2**

How many solutions are there to the equation below? 220=2x-12x a.1 b. Infinitely many c.2

**algebra2**

how many solutions are there to the equation below? 6x+30+4x=10(x+3) I want to know how to do this problems Please and Thank you

**algebra2**

How many solutions are there to the equation below? 145=10x-8x

**Algebra 2**

What is the solution to this equation? 4(x-8)+10=-10

**Math**

There eight girls competing in an ice=skating competition. In how many ways can they finish in first, second and third place? 366 1,680 2,016 40,320 I think it is 2,016

**psychology**

please help it's due today.!

**psychology**

PLEASE HELP LAST QUESTION.??? Among William James's contributions to the science of psychology is that he A. he wrote the first American text in psychology b.. developed a psychodynamic treatment for mental illness. c.experimented with classical conditioning d. developed ...

**ELA**

b?

**Science**

What kind of substance has properties that reflects light very well, warms up in my hand, flattens out when it hits with a hammer and conducts electricity?

**Chemistry - Solubility**

Ok, thanks for your help!

**Chemistry - Solubility**

Thanks! Just to clarify, is CuS considered a solid and not included in the calculation of k? I made an ice table and got the following equation: x^2/(0.150-4x)^4 = 2.66 x 10^-7 Is this the right process? Thanks.

**Chemistry - Solubility**

Calculate the solubility of copper(II) sulfide in a solution that is 0.150 mol L^-1 in NaCN. I am very confused on what to do. Since there are no common ions, I know that this is not the common ion effect. Also I do not believe this is a pH effect question. Is this a complex-...

**Trigonometry**

Can you please help me verify these? >sin7x-sin5x= tanx(cos7x-cos5x) >(1-cosx)cot(1/2x) = sinx >1+tanx tan(x/2) = secx Its very confusing because of all the double-half angle formulas >_<

**chemistry**

A solution contains 3.10 g of solute in 10.4 g of solvent. What is the mass percent of the solute in the solution?

**math**

Suppose you take out a loan for 180 days in the amount of $13,500 at 11% ordinary interest. After 50 days, you make a partial payment of $1,000. What is the final amount due on the loan?

**math**

198/18=11

**Math**

A bus is traveling at 79.7 kilometers Er hour east, how far does the bus travel 1.45 hours?

**Math: Finance**

Need help solving these finance questions? PV = C/r PV= C/r-g P= D/r-g 1st: Tom is 30 years old today. His salary next year will be $20,000. He forecasts salary growth of 5%/year and plans to retire at 60. 1) If the discount rate is 8%, what is the PV of his future salary ...

**Math**

The answer is 4 because 9-5=4. Not exactly sure how this is the answer, but that's the answer.

**geonetry**

What is the area of sector CED when DE = 15 yd?

**Can you help me find the answers?**

3n+5

**math homework**

What is the perimeter of a triangle whose sides measure 21cm, 16cm, and 19cm?

**chemistry**

how many moles of H2O are produced when 5.00 mols of oxygen gas are used

**math**

Finney & Company purchased $1,800 of merchandise on 5/6. The terms were 2/15 EOM. The sneakers were received on 5/20, sent FOB Shipping Point. Freight charges amounted to $45. What payment must be made by that date to take advantage of the discount?

**math**

Bert wants to make a larger version of a drawing he saw in a magazine. The drawing fits into a square with each side measuring 7 cm. If Bert makes his copy twice the size of the square measured in the original drawing, how much space will it cover on the paper he uses?

**Algebra**

t=56

**math 5th**

in the following addition problem, each letter stands for a different digit. Find the value of X, Y, and Z XYZ + ZYX _______ YYZY

**physics**

f a police car is traveling along at 40 mi/hr and speeds up to 90 mi/hr to catch a speeder and it takes a total time of 1hr to finally catch the speeder. what was the police car's acceleration?

**Math**

Cepheid variables are vital for measuring the distances of relatively nearby galaxies. What is the probability of finding a cepheid variable star? State ALL your assumptions

**Chemistry**

If 45g of a 2.2% NaHCo3 solution is to be prepared how many grams of NaHCo3 are needed

**math**

ms.joliet gave a math quiz to see how her small group was doing. what score would make the median 90, the mode 85, and the range 20 if she had the numbers listed below 85,85,90,?,100,85,80,100,90

**Spanish please translate from spanish to english**

1.) What is the higher premium? 2.) What is the lower premium? 3.) Is May 12. It is August 20. It's the first of December. Is December 1. 4.) Is twelve years old. 're Twelve. I have twelve.

**Please translate from spanish to english**

The Gutierrez family has two children. Ramon is 15. It is the oldest son. His birthday is August 20. Roger is 13. It is the youngest son. Roger's birthday is on December 1. Ramon and Roger have two cousins. They are called Lydia and Silvia. Lydia is 14 and is...

**Math**

Sally bought 3 tickets to the observation deck at the top of a skyscraper. She paid with a five-dollar bill and got 50 cents change. What was the cost of each ticket?

**math**

Nelson got a pack of 12 pencils he took three pencils to put in his desk at school and 2 pencils his locker at school what is a fraction of total pencils that nelson took to school?

**English**

What public health issue starts the escalation of misery in "top of the food chain"?

**Macroeconomics**

Consider the following data: The money supply in $1 trillion, the price level equals 2, and real GDP is $5 trillion in base-year dollars. What is the income velocity of money?

**Business math/Finite**

Find the amount accumulated in the sinking fund it $450 is deposited monthly for 20 years at 9% per year? (assume end_of_period deposits and compounding at the same intervals as deposits. Round your answer to the nearest cent.)

**Business math/Finite**

How long to the nearest year, will it take an investment to double if it is continuously compounded at 4% per year

**World Geography**

When attacking Russia in 1941,Germany...

**Chemistry**

Sn2O3

**physics**

How many significant figures are in 24.010

**chemistry**

Thank You!!!

**chemistry**

In a 1.0x10^-4 M solution of HClO(aq), identify the relative molar amounts of these species:HClO, OH-, H3O+, OCl-, H2O

**physics**

a car skids to a halt at a rate of -9.4 m/s2. the skid marks measure 34 m. what speed was the car going when it slammed on the brakes?

**algebra 2**

how do i find the are of the region defined by |x|+|y| less than or equal to 5 and |x|+|y| greater than or equal to?

**algebra 2**

how do i find the are of the region defined by |x|+|y| less than or equal to 5 and |x|+|y| greater than or equal to?

**math**

i believe its 1.9

**PHYSICAL SCIENCE**

An object has a length of 5.0 cm, a height of 3.0 cm and a width of 15.0 cm. It has a mass of 24 grams. What is its density?

**Physics**

Large boxes of pumpkins are set on a ramp to be unloaded out of a truck. The 300.0 lb boxes are set on the ramp which has an incline of 35 degrees. They must then be pushed to get started down the plane towards the bottom. If the coefficient of the static friction between the ...

**College Physics**

Large boxes of pumpkins are set on a ramp to be unloaded out of a truck. The 300.0 lb boxes are set on the ramp which has an incline of 35 degrees. They must then be pushed to get started down the plane towards the bottom. If the coefficient of the static friction between the ...

**Physics**

Assume a block on unknown weight rests on an incline of 25 degrees and is initially not moving. What push (P) is required to start moving the block if the coefficient of static friction is 0.7?

**Physics**

Assume a block on unknown weight rests on an incline of 25 degrees and is initially not moving. What push (P) is required to start moving the block if the coefficient of static friction is 0.7?

**science**

the patient reports numbness and tingling in the left lumbar area and pain in the contralateral femoral region

**science**

the patient reports numbness and tingling in the left lumbar area and pain in the contralateral femoral region

**math**

A new car comes in 5 exterior colors and 3 interior colors. How many different-looking cars are possible?

**math**

If Christopher wants to have the same number of hot dogs and buns, what is the minimum number of hot dogs he will have to buy?

**chemistry**

25mL of tap-water is titrated with .00500 M EDTA. 7.95mL of EDTA is required for complete reaction, Whatis the molarity of that total water hardness in the 25mL sample

**economics**

What do brokerage firms charge fees on

**Math**

I'm having a hard time with this problem. The book tells you the answer is 5, but I don't know how they got there. log(x+25)= 1+ log(2x-7)

**ap world history**

Can you compare North American racial ideologies and their effects on society with Latin American/Caribbean racial ideologies and their effects on society in 1500-1830?

**4th grade math**

mia gave1\3 of her 24 marbles to david how many david get

**Business Finance**

Assume a bank loan requires a interest payment of $85 per year and a principal payment of $1,000 at the end of the loan's eight-year life. a) How much could this loan be sold for to another bank if loans of similar quality carried a 8.5 percent interest rate?

**physics**

What is the length of a box in which the difference between an electron's first and second allowed energies is 1.30×10−19 ?

**math**

if the drama club would want 120 to people see them act and want to fill up 10 rows how many people are in each row

**math**

how do i show my work for, 5+10/(1*(8+6)-4=6 ya i know the answer but i wanna know how to show my work.