07/15/17

What percent of the phosphorus-32 decays each day?
The amount y (in grams) of the radioactive isotope phosphorus-32 remaining after t days is y=a(0.5)t/14, where a is the initial amount (in grams). Round the answer to the nearest hundredth of a... more
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07/15/17

If 7 necklaces have 756 beeds,how many beeds are there in 1 necklace
7 necklaces have 756 beeds,how many beeds are there in 1 necklace 
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07/15/17

A train covers 65km in 2 1/4 h.What distance will it cover in 3. 3/5h
Covers 65km in2 1/4h.What distance will it cover in 3 3/5h
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07/12/17

If the pressure in a syringe is 855 torr when the volume is 25.0 mL, what will the pressure be if you increase the volume to 50.0 mL?
(Assuming the temperature and number of moles are constant) Using P1V1T2=P2V2T1
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07/11/17

What is 75 minutes in hours to 2 decimal places?
I am on a job seekers course at my local library and part of it was a maths test to determine our maths level. One of the questions (which I cannot remember) had the answer of 75 minutes - but the... more
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07/11/17

Please show work and explain, Thanks!!
A 21.0-L sample of nitrogen at 7.40 atm and 24 Celcius is simultaneously expanded to 56.2 L and heated to 38 Celcius. What is the new pressure of the gas?
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07/11/17

It cost $16.10 to drive 3.5 miles. How much does it cost per 1 mile?
The kids came up with $4.60. I came up with a lower amount based on the 3.5 miles information. what to you think?
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07/11/17

If the total blood volume of an individual 5.2 L, how many grams of total blood cholesterol does the individual's body contain?
An individual suffering from high cholesterol levels in her blood has 232 mg of cholesterol per 100 mL of blood.
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07/11/17

why the graph of reaction rate is curved
as the equation is linear , the graph should be linear but the graph is curved . why so ?
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07/10/17

How many moles of NaCl are in 255 g of a 1.24 m NaCl solution?
If you could work me through the steps, that'd be great. Thanks
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07/10/17

The sum of two numbers is 56. the smaller number is 16 less than the larger number. What are the numbers?
Solving a word problem involving a sum and another basic relationship using a system of linear equations 
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07/10/17

The regular price of a t-shirt is $9.99 . It is on sale for 15% off. Sales tax is 6%. If you give the cashier a $10 bill, how much change will you receive?
must show all work
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07/08/17

Soil Lab (trace metals)
How would I calculate the amount of each metal in my groups sample? And how do I make the values I calculate are expressed in terms of amount of metal per amount of soil? &My final answers are... more
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07/07/17

The batch of sweets should contain how many lb of Brand A granola and how many lb of Brand B granola.
Brand A granola is 25% nuts and dried fruit and brand B granola is 20% nuts and dried fruit. How much of sweet item A and sweet item B should be mixed to form a 40-lb batch of sweets that is 24%... more
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07/07/17

One bag contains 3/5kg of corn. A farmer feeds his chickens 4 bags of corn each week. How many kilograms of corn do they eat each day?
I don't know what process i should do. 
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07/05/17

Why chromium +2 is act as a reducing agent &magnise +3 is act as a oxidising agent???
Please answer this question.......
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07/04/17

Calculate the concentration of sodium (gramsLgramsL) in sea water if a 1.80 liter sample of water contains 2.07 grams of sodium.
i need help. i think the answer is 1.15 but that is not right. 2.07/1.80= 1.15
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07/04/17

Chris has $300 and he wants to buy shoes. Each pair of shoes cost $20. How many pairs of shoes can he buy.
Chris has $300 and he wants to buy shoes. Each pair of shoes cost $20. How many pairs of shoes can he buy.
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07/03/17

How many grams of rust form when 220 kJ are released?
4Fe(s)+3O2(g)---->2Fe2O3(s) change H=-1.7x103 kJ
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07/02/17

i need to know what formula to use to solve this problem and how to solve please
i want to install carpeting in my new parlor. the room measurements are 15 ft long by 12 ft wide. carpeting sells for $36 per square yard and carpet padding cost $1.00 per sq ft. installation is a... more
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07/01/17

How many quarts of pure antifreeze must be added to 3 quarts of a 30​% antifreeze solution to obtain a 50% antifreeze​ solution?
homework homework
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07/01/17

average molar mass of dna
The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a... more
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06/29/17

When writing a short hand electron configuration what does the square brackets mean?
e.g. Calcium - [Ar] 4S^2 what does the square bracket around AR mean?   Thanks for you help!
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06/29/17

Trying to find out what precentage is being used.
Ok using discount card at pharmacy. I have 30 count. Retail totals $335.95 best i can figure. But after what ever % is deducted im left with $247.96. With this 30 count ive had to buy anywhere from... more
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06/28/17

Specific Heat
When 23.6 g of calcium chloride were dissolved in 300 mL of water in a calorimeter, the temperature of the water rose from 25.0 degree celsius to 38.7 degree celsius. What is the heat energy change... more
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