# Marian

Most popular questions and responses by Marian
1. ## Chemistry

The chemical reaction of 100 g of salicylic acid, C7H6O3, with excess acetic anhydride produces 50.0 g of aspirin, C9H8O4, according to the equation. What is the percentage yield for the reaction shown below? Please show your work. C7H6O3 + C4H6O3 →

Na+ and Se2-

3. ## algebra 1

h=-16t2+20t+24 gives the height h of the rock after t seconds. how many seconds does it take for the rock to hit the water 24+20=16t 44=16t 44/16=16/16 2.75 seconds

4. ## programming concepts

Input a list of positive numbers ( terminated by 0) into an array, find the mean ( average) of the numbers in the array, and output the result. Use a subprogram to input the numbers, a function to find the mean, and a sub-program to output the result.

5. ## physics

Which of the following is true about frictional forces? 1) They are stored as frictional potential energy. 2) They can decrease kinetic energy. 3) They produce heat potential energy. 4) They eventually convert to electromagnetic potential energy. 5) They

6. ## maths

This question is about plotting two points and drawing the straight line through them. Which two options are correct instructions for plotting two points which can then be used to draw the line y=2x+5. Select one or more. A) Plot the points (1.3) and

7. ## Physics

A 23.9kg box rests on a table. A 16 kg box is placed on top of the first box, as shown. determine the total in N that the table exerts on the first box.

8. ## Maths

Solve the equation, give your answer as a fraction in its lowest terms: x-2= 4x+7/6 (the whole part 4x+7 is over the 6) I'm getting -6 !!

9. ## general math

A souvenir store charges PHP 15.00 per keychain for orders amounting 50 or fewer keychains, PHP 12.50 per keychains for orders of 75 or fewer but more than 50 kechains. Which function best represents the cost K(x) of the x number of keychains. hi. i hope

10. ## Battle

The cost of chicken wings at the local supermarket increased from \$1.29 a pound the last month. About what percent increase I'd this?

11. ## algebra

Factorise the expressions 9y^2-25 x^2-x-12 I'm totally stuck!

12. ## maths

x^2-7x = 0 substitue x=7 into the equatiopn and explain why this shows that x=7 is the solution. ok so i do this: if x=7 then the equation becomes 7^2-49=0 7^2=49 49-49=0 so x=7 is correct (is that explanation enough?) now i have to write out a complete

13. ## Maths

Solve the equation: Give your answer as a fraction in its lowest terms: 2x-5=7-6x I'm getting -1/3 but i think that's wrong!?! Would appreciate some help please thanks! M

14. ## physics

What is the rotational speed of the hour hand on a clock?

15. ## Stats

There are two boxes, each with several million tickets marked “1” or “0”. The two boxes have the same number of tickets, but in one of the boxes, 49% of the tickets are marked “1” and in the other box 50.5% of the tickets are marked “1”.

16. ## chemistry

How many moles are in 1.50 x 1023 molecules NH3? A. 2.49 x 10 -1 mol NH3 B. 2.49 x 101 mol NH3 C. 2.65 x 10 -1 mol NH3 D. 2.78 x 10 1 mol NH3 maybe B

17. ## maths

Select the option that is the equation y=2x-2 rearranged to make x the subject of the equation. Select one: x=y+1 or x=-y/2+1 or x=-y+1 or x=-y/2-2 or x=y/2=1 or x=y-2 or x=-y-2

18. ## chemistry

How many moles of acetic acid are in 100ml of a 0.05M solution of acetic acid?

19. ## Algebra

A coin purse contains 5 centavo, 10 centavo and 25 centavo coin is 3 times as many 5 coinand the 25 centavo coins is two more than 10 centavo. And the total value is 4.90 pesos.how many of each kund of coins are there?

20. ## physics-lenses

trace and describe the image formed by a convex lens (object between 2f and f)

21. ## STATISTICS

TRUE OR FALSE? Simple regression cannot be applied when r of two variables is very low.

22. ## STATISTICS

Researchers asked questions in 1001 randomly selected adults in Russia. We found a statistically significant, strong positive correlation between income and the number of recycling bins filled their houses per week (r = 0,77). Choose the best

23. ## chemistry

How many atoms of H are in 6.0 moles of H2O? A. 7.22 x 1024 atoms B. 7.12 x 1027 atoms C. 7.32 x 1024 atoms D. 7.72 x 1024 atoms A

24. ## US Government

Describe 5 customs that Americans and people from India share.

this is for science what is solubility dependent on

26. ## math

if the manufacture from the question above charge a 4 1/2 late fee, how much would city cellular owe if they did not pay the balance by the net date?

27. ## MATHS

The slope of the straight line passing through the points (0,0) and (3,2) is: 2/3 TRUE OR FALSE?

28. ## MATHS

lim(sqrt(x^4-x^2))=0 True or false?

29. ## MATHS

The function f (x) = x^4 has an axis of symmetry the vertical axis y. True or False?

30. ## MATHS

In the values interval [0, 2p] the function f (x) = sin(x) has more periods by the function g (x) = sin(3x). True or False?

31. ## STATISTICS

True or False? A researcher is interested in studying whether there is a correlation of IQ with health. For this purpose he selected a sample of 261 people and asked them to complete two questionnaires: one for IQ and one for health. After evaluating the

32. ## speech

what figure of speech is "it is a lovely little bright snake of a word"

33. ## maths

I've put what i think are the answers at the bottom. Consider the inequality −2

34. ## maths

I've put what i think are the answers at the bottom. Consider the inequality −2 ¡Ü d

35. ## maths

I'm stuck here don't have a clue what to do. I've read all my school textbooks but it doesn't make much sense!! The numbers after the letters are small figures as in they u3 meaning( u x u x u). Ta! Factorise the expression 5 u3v +15 uv2-10v taking out the

36. ## maths

I am trying to understand what to do here.. need help asap!! Thanks! M Solve the following pair of simultaneous linear equations. 3x + 4y =5 2x + 2y =2 Select the option corresponds to the solution. Select one: x = 9 / 7, y = 2 / 7

37. ## space

What is space exploration?

38. ## space

What is the importance of Space exploration?

39. ## Science

What is the maximum that a shell can hold for electrons? What if there are 31 electrons?? I'm confused...

40. ## Music

Can someone please give me an example of a movie or literature that would make a successful Lied.

1. ## physics

Water

posted on June 25, 2019
2. ## Dynamics

For the angle.. the formula of coefficient of friction is tan θ=f θ=tan^-1(0.60) θ=30.96­­º >>degree of friction the formula to use for the angle from the horizontal is tan(θ(horizontal)-θ(friction))=v²/gr input the values and you will get

posted on July 20, 2018
3. ## Dynamics

A) V=35.3 mph, angle=31 deg g=gravity, u=coefficient of friction, r=radius, m=mass (which will be cancelled out later) N=m(v^2/r) uN=mg u(m(v^2/r)=mg You will get a formula of √rg/n for velocity v=√50(32.2)/0.6 v=51.8 ft/s or 35.3 mph

posted on July 20, 2018
4. ## accounting

Customer relations are usually part of: A. the supply chain B. the value chain. C. both the value chain and the supply D. neither the value chain nor the supply chain

posted on November 29, 2015
5. ## MATHS

thank you steve is correct!

posted on September 16, 2013
6. ## MATHS

i have limit x->0

posted on September 16, 2013
7. ## MATHS

Thank you Steve!!!

posted on September 9, 2013
8. ## MATHS

YES!!!! thank you very much!!

posted on September 9, 2013
9. ## STATISTICS

I state at the first row... True or false?

posted on September 6, 2013
10. ## Stats

ohhh.. Why? the significance is not 49%?

posted on August 1, 2013
11. ## chemistry

1. Since it's at the equivalence point, the pH will be 7.00!

posted on December 4, 2012
12. ## chemistry

my grandmother was being funny

posted on November 10, 2012
13. ## Maths

Thanks that helps me a lot!

posted on February 9, 2011
14. ## Math

Is this the full question? It seems confusing, something is missing in the instructions.

posted on February 9, 2011
15. ## Maths

Thanks. The final answer is 8 (if I'm right) but that means its not a fraction. so do I have to do something else or am I that bad at maths that I'm wrong again!!

posted on February 9, 2011
16. ## Maths

Maybe I'm reading it wrong but it looks like two DIFFERENT answers. Mykmoloko how'd you come up with the answer -3, I'm trying to understnad the way the methods work. Thanks M

posted on February 9, 2011
17. ## Maths

Thanks for that. hopefully I'll get a better grasp of equations soon!!

posted on February 9, 2011
18. ## Maths

Thanks. i got -60 the first time, but when i was checking it I was getting -6 so I'll have to see what i was doing wrong! Thanks!!

posted on February 9, 2011
19. ## maths

Thanks I understand now!

posted on February 7, 2011
20. ## accounting

what is the firm's predetermined fixed overhead rate

posted on November 9, 2010
21. ## US Government

Thanks so much! All I could find was that they also throw rice at weddings. I found a lot of differences in cultures, but couldn't find any specific similarities. Can you think of any more?

posted on April 12, 2010
22. ## Chemistry

thank you! :)

posted on February 27, 2010