Saturday
December 3, 2016

Posts by Erika

Total # Posts: 432

Algebra
I think D
November 28, 2016

Algebra
What are the equivalent fraction and decimal for 33 1/3%? A. 1/33 and 0.3 B. 1/33 and 3 C. 3 1/3 and 0.333333 D. 1/33 and 0.333333
November 28, 2016

Math
If you can measure the length and width of a rectangle correct within .1cm then the calculateday area will be correct .1cm as well. Is this true or false?
November 18, 2016

Calc
Evaluate the following integral using a geometric formula Integral of -2 to 6: |x-1|dx
November 18, 2016

Calculus
Use the second fundamental theorem of calculus to find F'(x) F(x)=The integral from 0 -> x^2 (Sin(x)^2)dx
November 18, 2016

Calculus
Find the average value of the function over [1,3] and all values of x in the interval for which the function: f(x)= 4(x^2+1)/x^2 equals its average value.
November 16, 2016

Maths
Let r'(t) represent the rate of growth of a dog in pounds per year. What does r(t) represent? What does integral of 2 to 6 r'(t) represent about the dog?
November 16, 2016

math geometry
Please help so hard. My problem... In the coordinate plane point C lies on line segment AB. The coordinates for MN are (2,4) and (16,12). If the ratio of the length of AC to the length of CB is 3:4, what is the x-coordinate of point C?
November 8, 2016

chemistry
Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coefficients. A precipitate forms when aqueous solutions of iron(II) iodide and sodium hydroxide are combined.
November 4, 2016

chemistry -3.2.4
Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D. (a) More product will ...
September 15, 2016

chemistry - 3.1.6
At a high temperature, the equilibrium constant for the decomposition of hydrogen iodide is 65.0. If the initial concentration of HI is 1.60 M, what is the concentration of hydrogen at equilibrium? 2Hl(g) H2(g) + I2(g) A. 1.42 M B. 0.753 M C. 0.240 M D. 0.802 M I'm ...
September 15, 2016

chemistry - 4.1.4
The [OH-] ion concentration of a sample is 1 × 10-10 M. What is the concentration of [H+] in the sample at 25°C? A. 1 × 10-14 M B. 1 × 10-4 M C. 1 × 10-10 M D. 1 × 10-6 M I think the answer is C. is this correct?
September 15, 2016

chemistry
The titration of HCl with NaOH is an example of: A. a strong acid-weak base titration. B. a weak acid-weak base titration. C. a weak acid-strong base titration. D. a strong acid-strong base titration. I know that this is a strong acid but not sure about the base? what do you ...
September 15, 2016

chemistry
What is a neutralization reaction? A. A reaction that involves neutral reactants B. A reaction in which the reactants are a salt and water C. A reaction in which the product is either acidic or basic D. A reaction that removes essentially all H+ and OH- I know that it isn'...
September 15, 2016

chemistry
I think that the answer to this one is A, as i know that the concentration of the reactants is high. I'm not sure about whether its products or reactants as the numerator though?
September 15, 2016

chemistry
If the equilibrium constant is much less than 1, what can you conclude about the concentrations of the reactants and products? A. Reactants are in the numerator of the equilibrium expression, so the concentration of the reactants is high. B. Products are in the numerator of ...
September 15, 2016

chemistry
How can you shift the equilibrium of the reaction between hydrogen and chlorine toward the products? H2(g) + Cl2(g) --> 2HCl(g) A. Add Cl2. B. Remove H2. C. Increase the pressure. D. Add HCl. would the answer to this one be to add Cl2? so answer A?
September 15, 2016

chemistry
not sure. can you show me how to work through it?
September 15, 2016

chemistry
Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D. (a) More product will ...
September 15, 2016

chemistry
the answer was B? K<Q
September 15, 2016

chemistry
The equilibrium constant for the formation of phosphorus pentachloride is 1.9. If the partial pressure of each gas is 0.5 atm, will the reaction (as written) proceed forward or backward to reach equilibrium? PCl3(g) + Cl2(g) PCl5(g) A. Backward, because K is greater than Q B. ...
September 15, 2016

chemistry
What effect does raising the temperature of the reaction chamber at a constant pressure have on the following reaction at equilibrium? 2NO2(g) N2O4(g) + heat A. The equilibrium shifts toward the reactants because the reverse reaction is endothermic. B. The concentration of NO2...
September 15, 2016

chemistry
Why does the density of gas in a hot air balloon decrease as the gas is heated? A. The mass of gas decreases as temperature increases. B. The mass of gas increases as temperature increases. C. The volume of gas decreases as temperature increases. D. The volume of gas increases...
September 14, 2016

AP Chemistry
sorry for commenting on a q that isn't mine but my calculator doesn't let me find the value for 10^-7. do you know why? and also what the value is?
September 14, 2016

chemistry
What is the chemical equation that describes the complete neutralization of H3PO4 by NaOH? A. H3PO4 + 2NaOH Na2HPO4 + 2H2O B. H3PO4 + H2O H2PO4- + H3O+ C. H3PO4 + NaOH NaH2PO4 + H2O D. H3PO4 + 3NaOH Na3PO4 + 3H2O
September 14, 2016

chemistry
Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base dissociate into their ...
September 14, 2016

chemistry
Knowing what information would allow you to order gas molecules according to their velocity? A. Pressure and temperature B. Volume and molecular mass C. Pressure and volume D. Temperature and molecular mass
September 14, 2016

chemistry
How does table salt (NaCl) dissolve in water? A. Water molecules hydrogen bond with sodium ions and chloride ions. B. Each sodium ion is surrounded by chloride ions. C. Each NaCl molecule is surrounded by water molecules. D. The oxygen atoms in water molecules attract sodium ...
September 14, 2016

geometry
The perimeter of triangle ABC is 13 cm. It was dilated to create triangle A'B'C' The perimeter of triangle...is cm
August 31, 2016

Biology
What is your answer?
August 30, 2016

medical insurance
the patient is seen by his family physician for follow-up treatment of recently diagnosed asthmatic bronchitis. the physician's fee is 75$. the patient copayment is 20$, and the patient is not required to pay any additional amount to provider. the payer reimburses the ...
July 14, 2016

math help please
The distance a spring stretches varies directly with the force applied to it. If a 7-pound weight stretches a spring a distance of 24.5 inches, how far will the spring stretch if a 12-pound weight is applied?
January 12, 2016

math help please
A jewelry store uses a markup rate of 70% on all items. If the wholesale price of a pair of earrings is $15.00, what is the retail price for the earrings?
January 12, 2016

math help please
Morgan had a bag of jolly ranchers. She counted 8 watermelon flavored candies in the bag of 46. If she bought a super-size bag with 138 jolly ranchers, how many could Morgan expect to be watermelon flavored?
January 12, 2016

math help please
Chumley from the TV show "Pawn Stars" bought some vintage watches for $15 each. He sold five of the watches for $36 each. What was the total amount of profit made for the watches sold?
January 12, 2016

math help please
On the blueprint of a portable stage is 1 cm = 10 m. The length of the stage on the blueprint is 2 cm and the width is 1/2 cm. What is the perimeter of the actual portable stage?
January 12, 2016

math help please
The graph gives a breakdown of the hours students use the tutoring center. If the graph is based on 300 students, how many used the center 8 to 10 hours during the week? 1-3 h 27% 3-5 h 22% 5-8 h 26% 8-10 h 15% over 10 h 10%
January 12, 2016

math help please
Miranda baked 48 muffins to sell at the school bake sale. She sold 2/3 of the muffins and gave the rest to her friends to eat. How many muffins did she sell?
January 12, 2016

math help
Claire earns a 15% commission from her lipstick sales. Her sales for the month of April were $400. How much commission did Claire earn for her April sales?
January 12, 2016

math help
On the blueprint of a portable stage is 1 cm = 10 m. The length of the stage on the blueprint is 2 cm and the width is 1/2 cm. What is the perimeter of the actual portable stage?
January 12, 2016

math help
The temperature at 1:00 pm on Tuesday was -13C. There was an increase of -6 per hour starting at 1:00 pm. Which of the following best represents the Celsius temperature n hours after 1:00 pm on Tuesday?
January 12, 2016

math help
Tia's parents gave her $20 to spend at the Spring Carnival. She spent $5 on a funnel cake and the remaining money on tickets for rides. If each ride ticket costs $0.75, how many ride tickets did she purchase?
January 12, 2016

math help
Jimmy spends ¾ of an hour getting ready for school. It takes 30 minutes to travel to school. If he needs to be at school at 9:00 am, what time should he get up?
January 12, 2016

math help
Hank rode his motorcycle half the distance from Lumberton to Wilmington, which are 70 miles apart. How many miles did he ride?
January 12, 2016

math
It is 3 miles around Westwood Park exercise trail. After skating around the trail 5½ times, Mr. Zorn lost a wheel. How many miles had he skated? Round your answer to the nearest mile.
January 12, 2016

math
Donald bought 10 woodcarvings for a total of $220. If they were all the same price, how much did he pay for each wood carving?
January 12, 2016

math 1
An advertiser needs a 4-inch picture of a 14 foot automobile. What is the scale factor? Write your answer in simplest form using a colon.
January 11, 2016

math 1
Sarah calculated the points she earned on her test. Sarah thought she earned 95 points but the teacher told her she actually only scored 85 points. What was Sarah's percent error. Round to the nearest tenth.
January 11, 2016

math
target is advertising a Sony camcorder for $299.99 this week. If the regular price is $329.99, what is the percent of discount customers are receiving for this item? Round your answer to the nearest whole number.
January 11, 2016

math
3.6 is 12% of what number?
January 11, 2016

math
A jewelry store purchases earrings from a manufacturer for $5.00 each. If the store wants to mark up the price by 75%, what will be the retail price of the earrings?
January 11, 2016

chemistry
How many formula units are in 1.31 mg of hydrogen peroxide (H2O2)? Answer in units of formula units. For 508 g of butadiene (C4H6) calculate the number of moles. Answer in units of mol. Calculate the number of molecules. Answer in units of molec. 016 1.0
January 10, 2016

chemistry
How many molecules are in 24.0 g NO2? Answer in units of molec.
January 10, 2016

chemistry
How many molecules are in 0.0700 mol NH3? Answer in units of molec.
January 10, 2016

chemistry
How many molecules are contained in 1.30 mol O2? Answer in units of molec.
January 10, 2016

chemistry
How many grams do 6.2×1024 atoms of argon weigh? Answer in units of g.
January 10, 2016

Math And Science for Young Children
No, A
January 9, 2016

Chemistry
A pot containing 500 g of water at 100 degrees Celsius would require how much energy to boil off completely
December 7, 2015

math 7th
a candle was 45 cm long .It was lit and 20% burned off .The candle went out.The next day it was lit again ,and 25% of the remaining candle burned out .then it went out On the third day the candle was lit 1/3 of the remaining amount burned off .then it went out .how long was ...
December 1, 2015

math 7th
the cost (c) is twice of the cost of a 7$ tape what is the price of the cd
December 1, 2015

math
Juan sold a boat that he bought 5 years ago. He sold it for 70%less than he originally paid for it. If the original cost is b , write an expression that shows how much he sold the boat for
November 18, 2015

math
Ms.Sue i need your help please
November 18, 2015

math
pine city (x) is less than or equal to 20 miles from sun vally depending on the route you take how many miles is pine city from sun vally
November 18, 2015

math
Ms .sue i think s is for march sales
November 18, 2015

math
this month`s sales of $85,000 are greater than 1/2 of the sales of march repesented by the letter . What was March`s sales .
November 18, 2015

Chemistry
How do you find the Ka1 and Ka2 of oxalic acid when it is in a solution that is 1.05 M H2C2O4 and has a pH of 0.67. [C2O4^2-] = 5.3x10^-5 M. I have tried using an ICE table for both reactions, as oxalic acid is a diprotic acid, but I am having trouble knowing where to put ...
November 1, 2015

Physics
A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 17.0 m/s when the hand is 1.50 m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)
September 17, 2015

Algebra
I'm trying to find the sum of this geometric series but I can't find a common ratio. How do I find it? 1+1/5+1/25+...
September 8, 2015

Algebra
I'm trying to find the sum of this geometric series but I can't find a common ratio. How do I find it? 1+1/5+1/25+...
September 8, 2015

Algebra
I've been try to solve this equation and I can't seem to get far. Do you add 3 to both sides? If not please explain to me how you solve this. Thanks :) 1/2=2/5c-3
September 1, 2015

organic chemistry
isobutyl tert pentyl acetylene has how many hyrogen atoms? iso=2 butyl=4 tert=4 pentyl=5 acetylene=2 28 h atoms? can you please teach me how to compute hydrogen atoms.. Neoheptane has how many atoms?
July 11, 2015

organic chemistry
evaluate the number of carbon for the ffg. pairs by writing G if greater, L if less than or E if equal 1. butene E sym dimethylethylene sol'n: butene has 4 carbons and sym dimethylethylene also has 4 carbons so it's equal. Am i right? 2. methylbutane L isopentane ...
July 11, 2015

algebra
morgan saw 10 blue cars 8 red cars and 42 white cars drive by her house in 1 hour what is the experimental probability that the next car will not be white
March 12, 2015

math
maria throws a ball straight up with an initial velocity of 10m/s what is its velocity at the highest point?
March 10, 2015

Math
Pick any single digit number. Multipy it by 12,345,679. Then multiply the result by 9. What happens? Explain why this works.
March 1, 2015

Math
John and Miles each had some money. First Miles gave John a quarter. Then John gave Miles one-third of his money. Then Miles gave John one-third of his money. At the end, John had $2.50 and Miles had $2.00. How much did they each start with?
February 26, 2015

Math
After dinner, three friends at a restaurant paid their bill and noticed a bowl of mints on the front counter. Sean took one-third of the mints but returned four because he had a momentary pang of guilt. Fred then took one-fourth of what was left but returned three for similar ...
February 22, 2015

Math
Three boxes each contain a number of billiard balls. One box contains only even-numbered balls, one box contains only odd numbered billiard balls, and the third box contains a mixture of odd and even numbered balls. All the boxes are mislabeled. By selecting one ball from only...
February 17, 2015

Math
A 6 story building has stairs between equally spaced doors. How many times higher is the climb from the first to the sixth floor than the climb from the first to the third floor?
February 16, 2015

math
Suppose in a town three-fourths of the men are married to one-half of the women. What is the ratio of men to women in this town?
February 12, 2015

Math
How did you get y=1.56x?
February 12, 2015

Math
Suppose in the early 1900s the levels of CO2 in the atmosphere was only 64% of the levels of CO2 today. What percentage more is the level of CO2 today compared to the levels of CO2 in the early 1900s?
February 12, 2015

Math
A mixture is 20% red paint, 35% yellow paint, and 45% water. If 5 quarts of red paint are added to 20 quarts of the mixture, what is the percentage of red paint in the new mixture?
February 10, 2015

Math
Well, I subtracted 1000-800= 200 miles, which was my remaining miles. She wants to finish at an average of 1000 mph so that she would have flown at an average of 1000mph, so speed is 1000mph. I plugged in this values in the formula: average speed=distance/time... 1000=200/time...
February 10, 2015

Math
A jet pilot is making a 1000 mile trip in her military Tomcat. She flies 800 mph for one hour and decides she wants to finish the trip so that she would have flown at an average of 1000 mph. How fast should she go to finish the trip and meet her goal?(Hint: Think carefully ...
February 10, 2015

Math
But, what shapes are those measurements?
February 10, 2015

Math
If a field has perimeter P, what shape maximizes the area? Justify your reasoning.
February 10, 2015

Math
Explain why the product of any two consecutive natural numbers is even. Prove your conjecture.
February 10, 2015

Math
Find all pairs of integers such that when they are added they equal 100, and when they are multiplied they are at least 2000.
February 10, 2015

Math
Pick what age you would like to be (may be your actual age if you like). Add 10. Multiply the result by 4. Add 200. Divide by 4. Subtract your original number. The final result is 60. Explain how I knew that.
February 10, 2015

Math
What is 100^2-99^2+98^2-97^2+96^2-95^2 +...+ 4^2-3^2+2^2-1^2 ? (Find an expression where n is the largest number being squared, then use it to calculate the sum when n = 100. Hint: Examine specific cases where n is small. Then generalize).
February 9, 2015

Math
In a group of 9 coins, one is fake and weighs slightly less. What is the fewest number of times you need to use a pan balance to find the counterfeit coins? (A pan balance is a scale used to measure weights, where weights are placed in two pans. The heaviest pan will go down ...
February 3, 2015

Math
Find the remainder when 3^997 is divided by 5. n=1 3n/5=3/5 n=2 3^2=9/25 n=3 3^3=27/5 n=4 3^4=81/5 n=5 3^5=243/5 r=3,4,2,1,3,4,2,1 n=997
February 3, 2015

Math
Randy had a sheep that started eating more and more as each day passed. on the first day, Tandy's sheep ate 5 carrots. On the second day, Randy's sheep ate 11 carrots. On the third day, the sheep ate 18 carrots. And on the fourth day, the gluttonous sheep ate 26 ...
February 3, 2015

statics
A1 Helicopter in flight with unbalanced stores A helicopter in forward flight is shown in Figure 1. The helicopter in forward flight experiences a horizontal drag force DF  . The drag force DF  is assumed to pass through O. The helicopter is held up in the air ...
February 2, 2015

237
Melanie walked her dog 2 1/5 miles. Cathy walked her dog 1 3/4 times as far as Melanie did how many miles Cathy walk her dog?
November 15, 2014

237
Melanie walked her dog 2 1/5 miles. Cathy walked her dog 1 3/4 times as far as Melanie did how many miles Cathy walk her dog?
November 15, 2014

Physics
You swing a 2.40kg stone in a circle, using the full length of a thin 60.0cm rope.
November 1, 2014

Physics
Your new designer chair has an S-shaped tubular metal frame that behaves just like a spring with the spring constant 13500 N/m. When your friend, who weighs 910 N, sits on the chair, how far does it bend?
September 26, 2014

math
never mind, i figured it out! :) g= 50
September 7, 2014

  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. 5
  7. Next>>