Questions on Algebra: Proportions answered by real tutors!

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Question 21419: Penelope gets the top score on a math test. 29 out of 30.What is her grade?
Click here to see answer by josmiceli(9693)

Question 21419: Penelope gets the top score on a math test. 29 out of 30.What is her grade?
Click here to see answer by Kuroinu(8)

Question 21437: b + a 1
_______ = ___

ab f
solve for b.
this is a proportion b+a over ab equals 1 over f.
after cross product i dont know how to get the b by it's self. I have been given the answer but dont know how to get there...
the answer is b= fa over a-f

Click here to see answer by Earlsdon(6287)

Question 21762: The area og a rectangle is 36. IF the length is 9, what is the perimeter?
The answer is 26, but how do you get the answer. Please show your work.
Click here to see answer by queenofit(120)

Question 22155: Jacket$65
Discount$30%
Sales Tax$4%
Click here to see answer by queenofit(120)

Question 22456: i dont understand how to do my homewrok?

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Question 22502: what is 3/x=42/28
Click here to see answer by stanbon(57377)

Question 22578: what is 8% of 75?
Click here to see answer by stanbon(57377)

Question 22559: please help!! okay how do you solve this proportion?
(3x-2)/4=(x+4)/2
Click here to see answer by wuwei96815(245)

Question 22688: Selena and Tracey play on a softball team. Selena has 8 hits out of
20 times at bat, and Tracey has 6 hits out of 16 times at bat. Based on
their past performance, what is the probability that both girls will get a
hit next time at bat?
Click here to see answer by stanbon(57377)

Question 22839: ((x^2-4)/(x^2-4x-21))/((x^2-7x+10)/(X^2-2x-35))
This particular problem has been giving me lots of trouble. I figured that you would have to factor the bottom of the fractions to make them have four terms but I am stuck there. Id appreciate the help Thanks!
Click here to see answer by rapaljer(4667)

Question 22845: Hello, My name is Tim Hunt.
I need help with some problems, Please help me.
1. A 10 ml vial contains 40 mg of a drug. How many mcg would be administered by injection of 2 ml of the drug?

2. many milliliters of a liquid laxative should be dispensed if the dose prescribed is for 1 tablespoonful qid for 3 days?
3. . If the flow rate for normal saline (NS) is 30 drops per minute over 6 hours, how many milliliters of NS would the patient receive (assuming 18 gtts/ml)?
PLEASE HELP IF YOU CAN
Click here to see answer by Earlsdon(6287)

Question 22856: Hello, My ame is Delores Pack
I'm not that good in math, so I came to place that probably can help me.
I'm struggling, and getting stressed out.
1. How many 0.0125 grain doses can be made from 3/8 grains of a drug?

2. A formula for 1000 tablets contains 11.5 grams of an antihistamine. How many grams of the antihistamine should be used to prepare 475 tablets?
3. If a syringe contains 28 mg of drug in 3 ml how many milligrams of the drug would a patient receive if 1.2 ml is administered?

Click here to see answer by Earlsdon(6287)

Question 22966: I need Help please.

How many milliequivalents of calcium are in a tablespoonful solution containing 250mg of calcium chloride (CaCl 2)? Atomic Weight of Ca++ = 40; Cl- =35.5)
Please Help
Click here to see answer by venugopalramana(3286)

Question 22976: Hello, This is Janice again.
To: venugopalramana(480)
You recently helped me with a math problem. But I was confused about something where did you get the 111mg from?
Click here to see answer by venugopalramana(3286)

Question 22865: Hello, Lavalle Williams
I need help with a problem or two. Please Help
1. If you have 20% ointment and 5% ointment, how many grams of each would you need to make 1 lb of 10% ointment?

2. How many milliequivalents of calcium are in a tablespoonful of a solution containing 250 mg of calcium chloride (CaCl2)? (AW of Ca++ = 40; Cl- = 35.5)
Click here to see answer by venugopalramana(3286)

Question 22864: This is Tim Hunt again.
I am confused about one of the questions you helped me with.
1 tablespoonful qid (four times a day) for 3 days (4 X 3) = 12 tablespoonsful.
1 Tablespoonful = 15 ml approximately. Perhaps your PDR has the exact conversion factor for this but I think it's more like 14.7868 ml per tbsp.
12 tbsp = 180 ml approximately.
12 tbsp = 177.4412 ml more precisely.
How did you get 14.7868
I know 12 x 15 = 180
and how did you get 177.4412?
Please help

Click here to see answer by Earlsdon(6287)

Question 22931: Hello, I need some help.
1. How many milliliters per hour would be required to infuse a dopamine dose of 5 mcg/kg/min to a patient weighing 220 lb. If the dopamine is provided by a bag containing 800 mg/500ml?

Click here to see answer by rapaljer(4667)

Question 21853: How do I find the scale factor for this problem?
On a "map" the ocean is 120ft deep,1"=20ft
What is the length and the scale factor?
I believe that the length on the "map" is 6"
Thank you for any help!!
Click here to see answer by rapaljer(4667)

Question 22930: Can someone help me with these problems I am so confused.
1. How many milligrams of zephirin chlorde are needed to prepare 3 L of 1:30,000 solution.

2. How many milliliers of a drug would be needed to provide a 10,000 mcg dose from a vial containing 0.1 g/10 ml?
3. An order is received to administer 5 mEq of potassium acetate per hour. The bag of I.V. fluid contains 30 mEq per liter. How many drops per minute would be needed to provide the prescribed dose using a set that delivers 15 gtts/ml?
Click here to see answer by stanbon(57377)

Question 23532: If you have 17.5 gallons how many gallons is it per hour?
Click here to see answer by rapaljer(4667)

Question 23905: Acording to doctors, a healthy diet should follow the ratio for meat to vegetables of 2.5 servings to every 4 servings. If you eat 7 servings of meat a week, how many servings of vegetables should you eat?
Click here to see answer by Paul(988)

Question 23907: a 150 pound person will burn 100 calories while sitting still for one hour. Following this ratio, how many calories will a 100 pound person burn while sitting still for one hour?
Click here to see answer by Alwayscheerful(414)

Question 23904: It has been found that the distance from a persons eye to the end of the fingers of his out reached hand is proportional to the distance between his eyes at a 10:1 ratio. If the distance between your eyes is 2.3 inches, what should the distance from your eye to your outstrecthed fingers be?
Click here to see answer by Sridi(6)

Question 24195: 1 4x 5 5
5 8
Those are mixed numbers how do i multaply them
Click here to see answer by jessica_lacross(3)

Question 24269: 15=3(x-2)-4x
Click here to see answer by lolaball(3)

Question 21467: hello, I have a story problem I could use some help with if you have time, A bag contains 6 red marbles, 9 blue marbles, and 5 green marbles. You withdrew one marble, replaced it, and then withdrew another marble. What is the probabilty that you do NOT pick 2 green marbles?
Click here to see answer by venugopalramana(3286)

Question 24268: how do i do a proportion using fractions and decimals.?
Click here to see answer by elima(1433)

Question 24369: What is the percent increase from 8 to10?
Click here to see answer by AnlytcPhil(1277)

Question 24370: What is.....solve the proportion x+6/3=8/5?
Click here to see answer by piglet162431(90)

Question 24667: Please help me solve this problem:
A shoe store sells 4 pairs of back shoes for every 7 pairs of brown shoes. There were 4,900 pairs of brown shoes last year. How many pairs of black shoes were sold?

Thank you!!!
Click here to see answer by stanbon(57377)

Question 24838: 3/5=x/15
Click here to see answer by elima(1433)

Question 24927: please show steps
Click here to see answer by stanbon(57377)

Question 24988: if b/d=a/b will a/b=c/d
Click here to see answer by rapaljer(4667)

Question 20986: how many parces are in one light-year??

Click here to see answer by LolaFish(5)

Question 25345: PlEase help me on this equation! I will be greatfulll apreaciated!

2 Hot dogs n
---------- = -----
$1.12 $3.86
3.86 * 2= $7.72 and then i get completley lost. round when neccesary
Click here to see answer by josmiceli(9693)

Question 25342: PlEase help me on this equation! I will be greatfulll apreaciated!

2 Hot dogs n
---------- = -----
$1.12 $3.86
3.86 * 2= $7.72 and then i get completley lost.
Click here to see answer by elima(1433)

Question 25348: 1 when the sum of 1/4 and 1/2 is divided by the product of 1/4 and 1/2 what is the quotient?
2 a pattern of pentagons and hexagons in a ratio of 3 to 5. If there are 12 pentagons how many hexagons are in the pattern?
Click here to see answer by askmemath(368)

Question 25344: Please show me how to do this! Thank you!
If a 30 oz can of lemonade drink mix makes 8 quarts, how much mix is needed to make 10 quarts of drink?
i know how to set it up but i don't know how to round the anwser to the nearest hundreth when neccessary

Click here to see answer by Earlsdon(6287)

Question 25620: Mrs. Johnson bought ten cans of vegetables - 2 cans of corn, 1 of beans, 5 of tomatoes, and 2 of beets. If she reaches into her cupboard and pulls out one without looking, what is the chance of it being beans?
Click here to see answer by venugopalramana(3286)

Question 25977: mike is 2 years older than his sister tia. twelve years ago he was twice as old as she was. how old are they now?
Click here to see answer by mike69(9)

Question 25976: 2 oranges and 5 apples cost $2.50 3 oranges and 4 apples cost $2.70 find the cost of an orange and an apple
Click here to see answer by Paul(988)

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