# valentina

Most popular questions and responses by valentina
1. ## math

Yvonne put \$4,000 in a savings account. At the end of 3 years, the account had earned \$960 in simple interest. A. how much does she have in her account at the end of 3 years? B. at what annual simple interest rate did the account grow? c. how many more

2. ## Chem

Write a balanced equation for: 1. beta decay of iodine-138 2. capture of an electron by cadmium-104

3. ## Chem

Write the two balanced equations, one for the incomplete combustion of methane (to form carbon monoxide and water vapor), and another one for the complete combustion of methane (forming carbon dioxide and whatever vapor). What are the conditions, at which

4. ## science

which of the following statements accurately describes the development of the geologic time scale?

5. ## math

Ashley uses 1/4 package of raisins for fruit cake. She then uses 1/9 of the remainder for the muffins.What fraction of the package of raisins does she have left? My answer is 2/3. 4/4-1/4=3/4(remainder). then 3/4 x 1/9= 1/12 (muffins)then

6. ## social studies

what significant contribution to Russian history did Prince Ivan III make?

7. ## math

this is the 5th grade problem. This is exactly what I have. Rosa and her friends used 1 2/3 quart of paint on Monday and 1 3/4 quart of pain on Tuesday.How much paint will Rosa and her friends need on Wednesday.If Rosa If Rosa and her friends have 3/4

8. ## Chemistry.

Which of the following changes will increase the amount of solid solute able to be dissolved in a liter of liquid water? decreasing pressure increasing temperature decreasing temperature increasing surface area

9. ## math

how can you write 8+8+8+=24 in multiplication way.

10. ## math

Rosa and her friends used 1 2/3 quart of paint on Monday and 1 3/4 quart of pain on Tuesday. If Rosa and her friends have 3/4 quart of pain left, do they have enough pain to finish the job on Wednesday?

11. ## chemistry

Explain how to make a 1.5M solution of copper (II) sulfate with a volume of 250 mL.

12. ## chemistry

How many grams of Lead (II) Nitrate are required to make a 350mL solution of 2.5M Pb2+?-

13. ## chemistry

write a balanced equation for the reaction of copper(II) sulfate with sodium carbonate to produce copper(II) carbonate and sodium sulfate

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (b) Work out and add the

15. ## PHYSICS URGENT URGENT URGENT URGENT HELP NEEDED!!!

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (b) Work out and add the

16. ## math

cindy can type 50 words a minute. At this rate, how many words can she type in a half hour?

17. ## education

In a minimum of 300 words, discuss at least five selection criteria you would use to “weed” the sites, explaining why you chose the criteria you

18. ## Math

A car and a truck leave the park at the same time, heading in opposite directions. when they are 350 miles apart, the car has gone 70 miles further than the truck. How far has the car traveled? Can someone please help me I am horrible in word problems

19. ## math

A scale drawing of an American flag is 14 inches long and 6 inches tall. The actual flag is 3 feet tall. a. True or False, the scale of the drawing is 2 in. : 1 ft. is it false? b. What is the perimeter of the american flag in the scale drawing? c. What is

20. ## Math

Mr. Singh deposited \$170 in his bank. The number of \$5 bills was three times the number of \$10 bills and the number of one dollar bills was 30 more than the number of five dollar bills how many bills of each type did he deposit

21. ## Physics

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (a) Draw a diagram for the

22. ## Physics

A ball of mass 0.15kg is dropped from a height of 1.0m onto a flat surface and rebounds to a height of 0.35m. Calculate: (a) The speed of the ball just before the impact, (b) The speed of the ball just after impact, (c) The change of momentum, (d) The

23. ## chemistry

If 2 moled of copper(II) sulfate react with 3 moles of sodium carbonate, identify the limiting reagent.

Colombian coffee beans cost \$5.50/lb while Peruvian coffee beans cost \$4.25/lb. We want to mix the beans together so as to produce a 40 lb bag costing \$4.60/ lb. How many pounds of each type of beans shouold be used ? Please help and show work

25. ## chemistry

A 0.194 g sample of compound is vaporized to fill a 100.0 mL vessel at 750. torr and 100.C. What is the molar mass and molecular formula?

27. ## chemistry

if you react one mole of sodium hyrdoxide with excess copper(II) sulfate, how many moles of copper(II) hydroxid are produced?

28. ## chemistry

Explain what a limiting agent is and how to identify it

29. ## Algebra

Solve the exponential by expressing each side as a power of the same base and then equating exponents. 5^x-2/4=squaroots 5 please help. Thanks!

30. ## Math

44% off of \$158

31. ## Math

What is the volume of a cone with a radius of 3 cm and a height of 6 cm? I can't get this one right for some reason!

32. ## chemistry

if 2.7 moles od sodium carbonate reacts with 5 moles of copper(II) sulfate, how many grams of sodium sulfate will be produced?

33. ## chemistry

if 25 grams of copper reacti with 70 grams of sodium carbonate, identify the limiting reagent.

34. ## chemistry

what are the theoretical mole ratios of copper(II) hydroxide and sodium sulfate?

35. ## chemistry

Why will a new nail react faster in copper sulfate solution than an old, rusty nail?

36. ## chemistry

If you submerge a silver teaspoon in copper sulfate solution, what reaction would you expect and why?

1. ## Math

Hello! I could have sworn I've been to this blog before but after going through some of the articles I realized it's new to me. Anyways, I'm definitely pleased I discovered it and I'll be book-marking it and checking back often! Køb Valencia fodboldtrøje

posted on April 23, 2019
2. ## Math

2

posted on April 15, 2019
3. ## Math

You sure are correct thanks for the help my child uses every this so much thanks

posted on February 21, 2018
4. ## Language arts

Snem

posted on December 1, 2017
5. ## math

432-49

posted on March 16, 2017
6. ## Math

actually the right expresion is 100-(5x4)

posted on March 12, 2017

1/2minutes

posted on March 8, 2017
8. ## math

-4x-31

posted on February 8, 2017
9. ## physics

12

posted on November 8, 2016
10. ## PHYSICS URGENT URGENT URGENT URGENT HELP NEEDED!!!

That doesn't help me because I still don't understand it. Please can you at least direct me on how to go about the question as my work is due very soon.

posted on October 30, 2016
11. ## PHYSICS URGENT URGENT URGENT URGENT HELP NEEDED!!!

weight ladder plus floor upward: 750 + 20.0= 770N wall force + friction at base: 20.0 + 0.40= 20.40N I have no idea what you mean about sum moments about any point.

posted on October 30, 2016
12. ## Physics

posted on October 30, 2016
13. ## PHYSICS

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (b) Work out and add the

posted on October 30, 2016
14. ## math

That is all information I have.My answer is: they need on Wed 1 4/5(Monday 1 2/3, Tuesday 1 3/4) So 3/4 is not enough.Is it correct?

posted on January 22, 2016
15. ## math help pls

3 is a

posted on October 30, 2015
16. ## english

u are correct except for number 2

posted on October 16, 2015
17. ## english

1. family, friends, and school work. 2. make us feel wise for buying our home years ago. 3. garden and return feeling much more relaxed.

posted on October 16, 2015
18. ## math

posted on October 16, 2015
19. ## Science

Data

posted on October 3, 2015
20. ## English

Thanks so much it was on our homework.... Our teacher said that she would give us a break so she gave us a sheet of word puzzles.

posted on January 10, 2012
21. ## Country Reports

dont know but i got iceland for my report 2!

posted on July 20, 2009