Saturday
March 8, 2014

# Search: how many nickels and dimes are in \$8.10

Number of results: 70,211

ALGEBRA 1
Stu has \$21.40 in dimes and quarters for a totl of 100 coins. How many of each kind of coin does he have?
Tuesday, May 29, 2012 at 6:51pm by susana

writing algebriac expression
The total amount of money (in cents) in y quarters, 7y dimes, and (2y - 1) nickles.
Wednesday, September 26, 2012 at 5:32pm by Sheila

Math help algebra HELP plz
Solve A collection of dimes and quarters is worth \$7.65. There are 45 coins in all . How many of each are there?
Thursday, December 13, 2012 at 11:48am by David

remember how I did the last one for you? original: y = (x+10)/(x-8) inverse: x = (y+10)/(y-8) xy - 8x = y+10 xy - y = 8x + 10 y(x-1) = (8x+10)/(x-1) f^-1 (x) = (8x+10)/(x-1) so we want: (8x+10)/(x-1) = x x^2 - x = 8x + 10 x^2 - 9x - 10 = 0 (x-10)(x+1) = 0 x = 10 or x = -1 ...
Tuesday, January 21, 2014 at 8:31am by Reiny

Math
Ratios- Please help The ratio of 5 3/5 to 2 1/10 The ratio of 7 dimes to 3 quarters Marc took 3 hours(h)to mow a lawn while Angelina took 150 minutes (min) to mow the same lawn a week earlier. Write the ratio of Marc's time to Angelina's time as a ratio of whole numbers.
Thursday, February 28, 2008 at 1:03pm by Sherri

math stuff
Do the exact calculation: 7182 x 2123= ________ Approximate to the nearest hundred _____x_____=__________ Difference between exacct and approximate value=_______ Can you help me with another problem too? N of the 20 coins are quarters and the rest are dimes. the total value of...
Saturday, April 7, 2007 at 8:02pm by Marisol

algebra
remember we can add or subtract only "like" terms so we have to form common denominators for each type (1/5)x^2 + (1/10)x^2 which is (3/10)x^2 ...... 1/5 + 1/10 =2/10+1/10 then (-1/5)x - (1/2)x = (-2/10)x - (5/10)x = (-7/10)x and finally -3/4 + 1/2 = -3/4 + 2/4 = -1/4 (1/5x^2-...
Sunday, July 17, 2011 at 4:43pm by Reiny

i don't understand this math
1. Which of the following is greater than 4.3 x 10^9 a. 2.1 x 10^9 b. 3.2 x 10^9 c. 5.3 x 10^9 d. 7.4 x 10^8 2. Which of the following is less than 6.5 x 10^-5 a. 1.4 x 10^-3 b. 2.5 x 10^-4 c. 7.8 x 10^-5 d. 4.6 x 10^-6 3. According to the 2010 census, the population of ...
Wednesday, September 12, 2012 at 5:35pm by Nyla

Math
Laverne has sixty-one coins, all of which are dimes and quarters. If the totoal value is \$9.85, how many of each kind of coin she has?
Wednesday, January 13, 2010 at 12:32am by Arthur

If a parking meter has 100 coins in it that add up to \$14.50, how man are dimes and how many are quarters?
Thursday, August 26, 2010 at 5:26pm by lauri

math
Gary has \$1.56 in change in his pocket. if there is a total of 19 coins, how may quarters, dimes, nickeland pennies does her have?
Monday, February 3, 2014 at 3:20pm by raquel

math
1. Which of the following is greater than 4.3 x 10^9 a. 2.1 x 10^9 b. 3.2 x 10^9 c. 5.3 x 10^9 d. 7.4 x 10^8 2. Which of the following is less than 6.5 x 10^-5 a. 1.4 x 10^-3 b. 2.5 x 10^-4 c. 7.8 x 10^-5 d. 4.6 x 10^-6 3. According to the 2010 census, the population of ...
Wednesday, September 12, 2012 at 3:37pm by Nyla

Algebra
1. Which of the following is greater than 4.3 x 10^9 a. 2.1 x 10^9 b. 3.2 x 10^9 c. 5.3 x 10^9 d. 7.4 x 10^8 2. Which of the following is less than 6.5 x 10^-5 a. 1.4 x 10^-3 b. 2.5 x 10^-4 c. 7.8 x 10^-5 d. 4.6 x 10^-6 3. According to the 2010 census, the population of ...
Wednesday, September 12, 2012 at 4:07pm by Chase

math
or, if you know the laws of exponents, 10^m / 10^n = 10^(m-n) if m=n, say 3, 10^3/10^3 = 10^(3-3) = 10^0 but 10^3/10^3 = 1 10^(m-m) = 10^0 = 10^m/10^m = 1
Wednesday, January 9, 2013 at 5:24pm by Steve

math help
1. Which of the following is greater than 4.3 x 10^9 a. 2.1 x 10^9 b. 3.2 x 10^9 c. 5.3 x 10^9 d. 7.4 x 10^8 2. Which of the following is less than 6.5 x 10^-5 a. 1.4 x 10^-3 b. 2.5 x 10^-4 c. 7.8 x 10^-5 d. 4.6 x 10^-6 3. According to the 2010 census, the population of ...
Wednesday, September 12, 2012 at 3:50pm by :)

math help
1. Which of the following is greater than 4.3 x 10^9 a. 2.1 x 10^9 b. 3.2 x 10^9 c. 5.3 x 10^9 d. 7.4 x 10^8 2. Which of the following is less than 6.5 x 10^-5 a. 1.4 x 10^-3 b. 2.5 x 10^-4 c. 7.8 x 10^-5 d. 4.6 x 10^-6 3. According to the 2010 census, the population of ...
Wednesday, September 12, 2012 at 4:25pm by :)

math
I assume 0 through 9 are allowed and repeats are possible. For example 000-0000 is allowed. How many prefixes? 10*10*10 = 1,000 how many digits 10*10*10*10 = 10,000 so 10^3 * 10^4 = 10^7 = 10 million I guess that is why they needed area codes.
Thursday, May 13, 2010 at 8:11pm by Damon

math
list the values in ascending order: x x x x x median: 10 (middle value is 10) x x 10 x x smallest: 10 (first value is 10) 10 x 10 x x mode=10: (no new values possible between smallest and median, which are the same) 10 10 10 x x range: 15 10 10 10 x 25 mean: 14 (means sum = 70...
Wednesday, February 15, 2012 at 8:57pm by Steve

Math
"when she put them in groups of 4 ,she had two dimes left over" ---> 6 10 14 18 22 26 30 34 38 42 46 50 ... "when she put them in group of 5,she had one left over" ----> 6 11 16 21 26 31 36 41 46 51 ... ahhh, looks like 46
Tuesday, March 12, 2013 at 7:44pm by Reiny

Math - Pre algebra
Help!!! 1. which of the following is greater than 4.3 x 10>9? a 2.1 x 10>9 b 3.2 x 10>9 c 5.3x 10>9 d 7.4 x 10>8 2. which of the following is less than 6.5 x 10>-5? a 1.4 x 10>-3 b 2.5 x 10-4 c 7.8 x 10-5 d 4.6 x 10>-6 according to the 2010 census the ...
Thursday, November 15, 2012 at 7:43pm by E.M

Math!
ok, here are the rest. Looks like some review is in order. when you multiply, you add powers. when you divide, you subtract powers. so (5 x 10^2) ÷ (2 x 10^3) = 5÷2 x 10^-2 ÷ 10^3 = 2.5 x 10^-5 (2.56 x 10^6) x (3.56 x 10^2) = 2.56x3.56 x 10^6x10^2 = 9.1136x10^8 population ...
Friday, September 27, 2013 at 12:37pm by Steve

pre algebra
danielle has 3 dimes, 2 quarters, and 5 nickles in her pocket. what is the probability that she chooses a dime followed by a quarter? is 3/5 the correct answer?
Wednesday, June 23, 2010 at 6:48pm by lavena

Algrebra-Systems of Equations
I'll work this one to give you an idea of how to do the others. Let D = # of dimes and Q = # of quarters. D = Q + 34 10D + 25Q = 1985
Thursday, January 19, 2012 at 12:39am by PsyDAG

Megan has three times as many quarters than nickels. She has one less dime than the number of quarters. If she has a total of \$4.30, how many of each coin does she have ?
Tuesday, October 18, 2011 at 4:14pm by patricia

Physics
1. μ represents Greek "mu" or 10^-6 or micro so 50 *10^-6 or 5.0*10^-5 meters 2. same deal 1 μ second is 10^-6 second 3. n, nano, means 10^-9 so 10 nm = 10^-9 = 1.0 * 10^-8 m 10^-8 m/10^-3 m/mm = 10^-5 mm 10^-8 m / 10^-6 m/μm = 10^-2 μm
Wednesday, January 28, 2009 at 9:03am by Damon

Statistics
In order to get a mean of 4/6, you would need to pick four 1's and two 0's. The probability of picking a 1 (with replacement) is 6/10 each time and probability of picking a 0 (with replacement) is 4/10. So, (6/10)*(6/10)*(6/10)*(6/10)*(4/10)*(4/10) However, you can pick the ...
Tuesday, December 14, 2010 at 3:28am by TutorCat

7th grade math - can't figure this out!
Ummmh, doesn't 10^5 mean 10 x 10 x 10 x 10 x 10 ?? So if we multiply by another 10 , how many 10's will we have now ?
Wednesday, October 3, 2012 at 8:11pm by Reiny

math
For n=1, 3^(n-1)/10 = 1/10 For n=2, 3^1/10 = 3/10 For n=3, 3^2/10 = 9/10 For n=4, 3^3/10 = 27/10 The ratio of successive terms is 3. I don't know why you wrote "bracket" at the end of your question.
Thursday, November 5, 2009 at 11:10pm by drwls

Math
pretty slim data how about 2 10 10 10 10 10 ... or 2 10 10 2 or 2 10 10 300
Tuesday, January 1, 2013 at 5:24pm by Steve

I have a bunch of nickels and quarters worth \$7.85 in my [pocket. How do I write a system of equation to solve and determine how many of each coin I have!!
Wednesday, June 12, 2013 at 8:27pm by Blakey

MATH
Do a little investigation and you'll see the pattern 10^0 = 1 10^-1 = 1/10 = 0.1 10^-2 = 1/100 = 0.01 ... a billion is a thousand million = 10^3 * 10^6 = 10^9 I think you meant 10^5 -- that would be a 1 with 5 zeros = 10000
Monday, October 17, 2011 at 8:54pm by Steve

word problems
She made a profit of a dime per apple. How many dimes are in \$2.20? Then add two more for the apples she ate.
Sunday, September 28, 2008 at 7:38pm by Ms. Sue

Math
Please show me how to do this problem please. The ratio of 7 dimes to 3 quarters.
Friday, February 29, 2008 at 2:51pm by Danielle

Math
1 quarter plus 3 pennies 2 dimes, 1 nickel, and 3 pennies
Monday, October 1, 2012 at 6:29pm by Ms. Sue

math
dimes --- x quarters ---- 28-x 10x + 25(28-x) = 430 etc
Tuesday, June 11, 2013 at 5:32pm by Reiny

math
three quarters are what percent of three dimes in value?
Thursday, May 27, 2010 at 4:24pm by Anonymous

math
6 1/2 - 4 7/10 When we subtract fractions, we must use a common denominator. 6 1/2 = 6 5/10 6 5/10 - 4 7/10 Now we need to borrow (or regroup). 6 5/10 = 5 15/10 5 15/10 - 4 7/10 = 1 8/10 = 1 4/5
Monday, May 7, 2012 at 12:50pm by Ms. Sue

math
number of dimes --- x number of quarters -- x+3 10x + 25(x+3) = 565 solve for x
Wednesday, January 30, 2013 at 7:59pm by Reiny

Math
1. (6.0 x 10^5) x (3.0 x 10^4) = a. 18 x 10^20 b. 18 x 10^9 c. 1.8 x 10^20 d. 1.8 x 10^9 2. (5 x 10^-2) ÷ (2 x 10^3) = a. 2.5 x 10^-5 b. 2.5 x 10^-1 c. 25 x 10^1 d. 25 x 10^2 3. (2.56 x 10^6) x (3.56 x 10^2) = a. 9.1136 x 10^12 b. 91.136 x 10^8 c. 9.1136 x 10^8 d. 91.136 x 10^...
Thursday, September 13, 2012 at 3:46pm by Chase

chem
Or another way is 3 x 10^3 + 4.0 x 10^4 = 3 x 10^3 + 40 x 10^3 = 43 x 10^3 = 4.3 x 10^4 Or a third way is 0.3 x 10^4 + 4.0 x 10^4 = 4.3 x 10^4 For purposes of using some method to perform significant figures checks, I think the latter is the best.
Monday, February 11, 2008 at 9:39pm by DrBob222

algebra 1
let d = the number of dimes, and q = the number of quarters. d + q = 100 0.10d + 0.25q = 14.05
Sunday, January 31, 2010 at 12:50pm by Marth

math
peer has \$4.20 in dimes and quarters. He has 21 coins. How many coins of each kind does he have?
Sunday, January 30, 2011 at 2:13pm by joe

Math
I have a question: How would you solve this? a dozen dozen apples at half a dozen dimes a dozen? In this cause is dozen 12? And half a dozen dimes in 60 cents? would that be 120? b/c a dozen dozen is 24 so u have 24 apples and then you have 60 cents per dozen so two dozen ...
Tuesday, December 5, 2006 at 5:49pm by Gina

Math
number of quarters --- y number of dimes ---- 33-y
Monday, September 17, 2012 at 9:57pm by Reiny

physics
m = 9.11 * 10^-31 vi = 3 * 10^5 vf = 8 * 10^5 vf = vi + a t d = Vi t + .5 a t^2 10^-1 = 3*10^5 t + .5 a t^2 or 1 = 3*10^6 t + 5 a t^2 but t = (8-3)10^5 /a so 1 = 3*10^6 (5*10^5/a ) +5 (25*10^10/a) a = 15*10^11 + 12.5*10^11 a = 27.5 * 10^11 kg F = ma = 9*10^-31*27.5*10^11 = 247...
Monday, October 17, 2011 at 10:47am by Damon

physics
Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); A is (1.0*10^-3,2.6*10^6), B is (4.0*10^-3,2.0*10^6), C is...
Thursday, July 25, 2013 at 9:43pm by Justin

physics
Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); A is (1.0*10^-3,2.6*10^6), B is (4.0*10^-3,2.0*10^6), C is...
Friday, July 26, 2013 at 2:05pm by Justin

physics
Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); A is (1.0*10^-3,2.6*10^6), B is (4.0*10^-3,2.0*10^6), C is...
Sunday, July 28, 2013 at 1:31am by Justin

physics
Calculate the net work output of a heat engine following path ABCDA in Figure 14.30, where horizontal axis is V and each unit is 0.5*10^-3 m^3, V1 = 1.0*10^-3 m^3 and V2 = 4.0*10^-3 m^3. The vertical axis is P(N/m^2); A is (1.0*10^-3,2.6*10^6), B is (4.0*10^-3,2.0*10^6), C is...
Sunday, July 28, 2013 at 5:34pm by Justin

alegbra 1
q(.25) + (100-q)(.1) = 15.70 .25 q + 10 - .1 q = 15.7 .15 q = 5.7 q = 38 then dimes = 100 - 38 = 62 check 38(.25) + 62(.1) = 15.7 yes
Friday, March 18, 2011 at 12:32am by Damon

math
greg has 2 quarter, 1 dim, and 3 nicles. stan has 3 quarters, 2 dimes, and 2 nickles. how can they share the coins so that they both have the same amount of money
Monday, December 10, 2012 at 6:10pm by mythreyee

You are supposed to do this with play money. Jamie could have spend 5 dollars with 3 one dollar bills, and 20 dimes. Check that
Thursday, January 31, 2013 at 6:24pm by bobpursley

math
suppose you had \$1.76 in dimes and pennies. What is the fewest number of coins you could have? What coins are they?
Monday, January 23, 2012 at 4:46pm by sunny

math
Three dimes are tossed at the same time. What is the probability that all three land on heads?
Thursday, October 17, 2013 at 3:30pm by Anonymous

math
Trista has 8 coins in her pocket that total to \$1.55.She only has quarters and dimes.How many of each coin does Trista have?
Monday, September 21, 2009 at 8:55pm by Daysi

algebra
if i had 100 dimes and quarters and the total value was \$14.05, how many quarters would i have?
Thursday, March 15, 2012 at 11:04pm by Marcy

Chemistry
No, 10/0 is an indeterminate value. You can prove that to yourself. 10/0 = 0 but 0*0 = 0 which isn't 10. 10/0 = 1 but 1*0 = 0 which isn't 10. 10/0 = 5 but 5*0 = 0 which isn't 10. 10/0 = 1,000 but 1000*0 = 0 which isn't 10. etc. The bottom line to the answer of 10/0 = any ...
Wednesday, February 9, 2011 at 12:04am by DrBob222

math
To solve your problem you need to multiply. 10/7 is not 1 3/10. 10/7 = 1 3/7 9/10 of 10/7 = 9/10 * 10/7 9/10 * 10/7 = 90/70 = 1 20/70 = 1 2/7
Tuesday, January 22, 2008 at 7:05pm by Ms. Sue

Marciella has a bag that contains 35 nickels and quarters. The total value of these coins is less than \$2.50. What is the maximum number of quarters that meets these conditions?
Wednesday, April 7, 2010 at 9:20pm by David Nipp

Algebra 2
Jessica's bank contains 18 quarters & dimes, of which q are quarters. Find the total value of the coins in dollars.
Monday, September 15, 2008 at 1:20pm by Kim

math 156
how many different ways can you make change for 75cents using quarters dimes and nickles? is it 17 ways??
Sunday, December 13, 2009 at 5:50pm by Rmz

Math
Arthur has dimes and quarters, total number of coins is 35. The value of his collection is \$5.00. What number of each type is there?
Monday, September 6, 2010 at 4:48pm by Stuff

college algebra
tom has 17 coins in his pocket worth \$1.30. If he has only dimes and nickles, how many coins of each does he have?
Thursday, June 23, 2011 at 12:31pm by Anonymous

Algebra 2
Jessica's bank contains 18 quarters and dimes, of which q are quarters. Find the total value of the coins in dollars.
Monday, September 2, 2013 at 7:34pm by Nina

Algebra 2
Jessica's bank contains 18 quarters and dimes, of which q are quarters. Find the total value of the coins in dollars.
Monday, September 2, 2013 at 4:43pm by Nina

math
a) Write the ratio 5 to 9 as a fraction. b) Write the ratio of 3 nickels to 3 quarters in simplest form
Sunday, November 15, 2009 at 11:10am by Anonymous

math
a) Write the ratio 5 to 9 as a fraction. b) Write the ratio of 3 nickels to 3 quarters in simplest form
Sunday, November 15, 2009 at 12:02pm by Anonymous

Math
Penny and dime, penny and two nickels, 6 pennies and a nickel, 11 pennies.
Thursday, December 6, 2012 at 6:28pm by PsyDAG

math
There could be two fact families. 10 = 7 + ? 10 = ? + 7 10 - ? = 7 10 - 7 = ? 10 = 8 + ? 10 = ? + 8 10 - ? = 8 10 - 8 = ? I hope this helps.
Tuesday, January 19, 2010 at 9:25pm by PsyDAG

precalc
Use Sigma Notation to write the sum [10-(1/10)^2]+[10-(2/10)^2]+[10-(3/10)^2]+[10-(4/10)^2]
Sunday, December 4, 2011 at 7:25pm by Alex

math
find the 5 diff. ways a collection of 100 coins-pennies, dimes, and quarters- can be worth exactly worth \$4.99.
Tuesday, January 27, 2009 at 10:25pm by Julie

math
if you have 15 coins in a bag and their total amount is \$2.70 how many quarters and dimes are in the bag? Use substitution to solve
Saturday, February 26, 2011 at 3:22pm by mary

Algebra
(5.5)(8) x 10^-10 = 44 x 10^-10 = 4.4 x 10^-9 how did you get +10 ???? scientific notation consists of a number with a single digit, followed by a decimal x 10^(some exponent)
Wednesday, February 6, 2013 at 7:32pm by Reiny

Math
11 5/10 9 1/10 + 7 2/5 you have to find the common denominators of 1/10 and 2/5 which is 10 so you leave 1/10 the same and multiply 2/5 with 2 each to get 4/10 then you add 1/10 + 4/10 which is equal to 5/10. now that you got that just add the 9+7 you get 11 so your answer is ...
Saturday, October 8, 2011 at 12:07pm by samantha

Math
Question 2 For the function f(x) = 3x2-2x-7, find f(2). Answer f(2) = 13 f(2) = 25 f(2) = 1 f(2) = 1/2 3 points Question 3 One day you work 3 hours and your boss gives you \$22. Another day after working 4 hours your boss gives you \$33. Yesterday after working 5 hours you get \$...
Friday, May 18, 2012 at 10:34pm by adam

Chemistry
I have the following equation: 0.5 ug/L x 1g/10^-6ug x 1 mol/27 g I can't divide by 10^-6...how do I rearrange the equation? What is the problem with dividing by 10^-6? Anyway, you can multiply by 10^6 instead. I end up with an error message when I divide 1/10^-6... so, you ...
Tuesday, January 23, 2007 at 4:32pm by Steve

precalculus
try x = 2 16+8+16 +20 - 60 = 0 sure enough x = 2 works so divide by (x-2) x^3 + 3 x^2 + 10 x + 30 write as x^3+10 x +3(x^2 +10) x(x^2+10) + 3(x^2+10) (x+3)(x^2+10) so x = -3 is a root left with x^2 = -10 x = +/- i sqrt(10) so 2, -3, i sqrt 10 , -i sqrt 10
Saturday, November 12, 2011 at 9:32pm by Damon

how to make \$60 two ways using 3 coins
You would have to use a 50 cent coin and then two nickels t equal 60 cents.
Wednesday, July 6, 2011 at 9:15pm by Allison

Physics
Your method looks OK to me. Let the charges be q and 2q. 1.2*10^-9 N = k *2 q^2/ r^2 k = 9.0*10^9 N m^2/C^2 r = 4.0*10^-2 m q^2 = (1/2)(0.04)^2 * 1.2*10^-9/9.0*10^9 = 1.06*10^-22 C^2 q = 1.03*10^-11 C The other particle has twice that charge.
Tuesday, April 14, 2009 at 11:07pm by drwls

math/chem
1) 35.72 x 0.00590 2) 0.4832/5.12 3) (6.09 x 10^-1)(9.08 x 10^5) 4) (7.79 x 10^4)(4.56 x 10^3)/ (2.93 x10^3)(3.2 x 10^2) 5) 2.3 x 10^2 + 7.16 x 10^5
Saturday, September 12, 2009 at 5:29pm by jay

algebra 1
x + 7/10 = -1/5 We need to get the known quantities on one side and the unknowns on the other side. First subtract 7/10 from both sides of the equation. x + 7/10 - 7/10 = -1/5 - 7/10 x = -2/10 - 7/10 x = -9/10
Tuesday, December 7, 2010 at 4:56pm by Ms. Sue

math
it would be possible to have 3 quarters, 4 dimes, and 4 pennies in your pocket and not be able to make change for a dollar, so the answer would be \$1.19.
Monday, September 26, 2011 at 5:49pm by Katie

math
Maya hs 65 dimes and 104 pennies. She will put them in packages that are all the same. What is the greatest number of packages she can make?
Wednesday, January 23, 2013 at 4:35pm by Anonymous

math
mikas piggy bank cotains 12 pennies6nickels4 dimes and 8 quarters.which best represents the fraction of mikas coins that are pennies1
Tuesday, March 19, 2013 at 6:44pm by savannah

Acc. Algebra 2
A jar contains 40 coins consisting of dimes and quarters and having a total value of \$4.90. How many of each kind if coins are there?
Tuesday, September 3, 2013 at 8:56pm by Lisa

math
Solve the following and express the answer in scientific notation: 10^3 x 10^4 x 10^-2 A. 10^5 B. 10^6 C. 10^7 d. 10^8 I say A
Wednesday, November 7, 2012 at 4:27pm by shana

Chemistry
A 0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 ´ 10^-4 M. What is the equilibrium constant, Ka, for this acid? a. 5.0 ´ 10^-2 b. 5.0 ´ 10^-3 c. 2.5 ´ 10^-4 d. 2.5 ´ 10^-5 e. 2.5 ´ 10^-6 2. (Points: 1) What is the carbonate-ion, CO3^-2, ...
Thursday, May 13, 2010 at 7:34am by write2khin

Chemistry
0.10 M solution of a weak monoprotic acid has a hydronium-ion concentration of 5.0 * 10^-4 M. What is the equilibrium constant, Ka, for this acid? a. 5.0 *10^-2 b. 5.0 * 10^-3 c. 2.5 * 10^-4 d. 2.5 * 10^-5 e. 2.5 * 10^-6 2. (Points: 1) What is the carbonate-ion, CO3^-2, ...
Thursday, May 13, 2010 at 5:26pm by wite2khin

math
Melissa has 10 coins in her pocket. 2 quarters 3 dimes 4 nickel 1 penny What is the theoretical probability of pulling a quarter out of your pocket, putting it back, then pulling out a penn? My answer is 1/50 Also what is the theoretical probability of pulling a nickel out of ...
Thursday, January 9, 2014 at 7:07pm by Kyle

chemistry
Use algebra to solve the quadratic equation 1.7*10^-5 *(c - 0.02) = 4*10^-4 c^2 which can be rewritten 4*10^-4 c^2- 1.7*10^-5 c +3.4*10^-7 = 0 c^2 -4.25*10-2 c + 8.5*10^-4 = 0 It appears there is no real-number solution to this equation, because B^2 - 4AC is negative. (A, B ...
Saturday, February 14, 2009 at 3:35pm by drwls

7. In the expression 7x  5x2 + 5, what is the coefficient of x? 7 5 5 7 8. Write the expression using a single exponent. 2^2  2^8 4^10 2^10 4^16 2^16 9. Write the expression using scientific notation. (2.5  104)(4  103) 10  10^7 10  10^8 1  10^8 10 10^12 My answers...
Monday, May 6, 2013 at 7:46pm by Delilah

Finite Math
Please help with this problem. In a student writing contest with 25 entries, 3 essays are selected for first, second, and third place awards and 5 are selected for honorable mention. How many ways can this be done? Thanks. Ok Gen, for the first place there are 25 choices, for ...
Tuesday, July 25, 2006 at 1:08pm by Gen

1mm (1 milimeter)=(1/1000m)=10^-3m 1ė=1mikron=1/1000mm=10^(-3)mm=10^(-6)m 1mė=1milimikron=(1/1000)ė=10^(-3)ė= 10^(-9)m 2.5m=2.5/10^(-9)=2.5*10^9= 2500000000 mė
Tuesday, March 29, 2011 at 8:35pm by Anonymous

math
q+d=15 .25q+.10d=2.70 d=15-q .25q+.10(15-q)=2.70 .25q+1.50-.10q=2.70 .25q-.10q=1.20 .15q=1.20 q=8 q+d=15 8+d=15 d=15-8 d=7 d stands for dimes q stands for quarters
Saturday, February 26, 2011 at 3:22pm by Ryan

For Mattie - Math
2 X 10 square + 3 X 10 to the first + 5 X 10 to the zero +7 X 10 to the negative one in "math" = 2(10^2) + 3(10) + 5(10^0) + 7(10^-1) = 200 + 30 + 5 + 7/10 =235.7 looks like we have the number 235.7 decomposed into its different position values.
Friday, December 7, 2012 at 7:18am by Reiny

If Q = # quarters and D = # dimes. Then Q+D=61 .25Q+.10D=9.85 ================= Two equations and two unknowns. Solve for Q and D. Check my work.
Sunday, March 8, 2009 at 10:33pm by DrBob222

chemistry
A particular solution has a [H3O+] 2.44 x 10^-4. Therefore, the [OH-]= 4.10 x 10^3 4.10 x 10^-11 2.44 x 10^-4 1.71 x 10^-8 9.09 x 10^-16
Monday, December 5, 2011 at 2:45pm by Anonymous

precal
10^x/10 = (0.01)^1/3 I see base 10 all over the place 10^(x-1) = ((1/10)^2)^(1/3) 10^x-1 = 10^(-2/3) so x-1 = -2/3 x = 1/3
Saturday, August 28, 2010 at 8:02pm by Reiny