Science & Mathematics - 11 July 2007

Find the derivative:

1. y=9x^4-5x^2+3x-4
My answer is 36x^3-10x-3

2. y=9x^(-1) - 3x^(-2)+13
Answer: -9x^(-2) +6x ^ (-3)

3. How do I find the derivative for

h(x)= 6/x^6- 5/x^5+ 4 Square root of x?

Thanks

2007-07-11 14:55:50 · 6 answers · asked by Anonymous in Mathematics

I missed class today and need someone to help me by explaining how to solve a rational formula for a given letter. For example my book shows a problem like this one:

y-b/m=x for : y

note: the / symbol is what I used to make it a fraction since I can't draw on this thing. Anyhow if anyone has some tricks on how to solve things like this it would help since the book only has three example with the same problem (which doesn't help at all!)

THANK YOU!

2007-07-11 14:49:39 · 7 answers · asked by natibiris 3 in Mathematics

I'm trying to major in computer science, and I have yet to take a class (will take one in fall). I'm just wondering if it has logarithms from Pre-cal.

I think I LOVE logarithms!!! (:

2007-07-11 14:49:19 · 3 answers · asked by Anonymous in Mathematics

Which does not represent a possible intersection of a line and a right cone with height 4 cm?

here are the choices.
3 points
2 points
1 point
a segment

2007-07-11 14:29:54 · 4 answers · asked by Anonymous in Mathematics

1. A population, P, is increasing exponentially. At time t=0 years, the population is 35,000. In 10 years, the population is 44m 400.

a) Find the growth rate, b, in P(t) = a(b)^t. (note: lil t on top)
b) using the value of b calculated in part a), write an equation that models the population, P, after t years.
c) using your equation, find the population after 25 years.

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2. u want to buy a new car, u have investigated the trade in value of ur current car. three months ago, the trade-in value was 3200$. now it is 3125$- what will be the trade in value of ur car 6 months from now if it is depreciating exponentially.

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3. the temperature of a cooling liquid over time can be modelled by the exponential function: T(x) 60(1/2) ^x/30 + 20. (** 20 is not a little number lol whatever they are called**). where T(x) is the temperature, in degrees Celsius, and x is the elapsed time, in minutes. determine the temperature after 2 hours.

2007-07-11 14:29:50 · 1 answers · asked by orangegreenyellow 1 in Mathematics

Describe the locus of all points that are 3 cm from a point m.
choices->
a line, 3 cm from line m
a pair of parallel lines, each parallel to and 3 cm from line m
a sphere with a radius of 3 cm
a circle with a diameter of 6 cm

2007-07-11 14:27:25 · 5 answers · asked by Anonymous in Mathematics

2007-07-11 14:27:16 · 9 answers · asked by Gypsy Gal 6 in Geography

2007-07-11 14:25:42 · 6 answers · asked by lzhnyk 1 in Mathematics

please help me.

2007-07-11 14:22:43 · 6 answers · asked by Anonymous in Mathematics

Let M be the set of all even numbers from 1 to 25 and all the odd
numbers between 26 and 200.

If all the elements of M are multiplied , find the number of zeros at the end of this product.

(1)22
(2)18
(3)23
(4)21

2007-07-11 14:19:34 · 1 answers · asked by sanko 1 in Mathematics

A dealer bought a phonograph for P160.00. For how many pesos must he mark it so that after deducting 10% of the marked price he may sell at a profit of 12-1/2 % of the cost.

2007-07-11 14:18:07 · 2 answers · asked by jonathanaljomargonzales 1 in Mathematics

Clerk F files a certain quantity of cards in 2 1/2 hours. Clerk G can do the work in 3 hours. At these rates, in how many minutes can Clerk F file alone for 2 hours ?

2007-07-11 14:13:55 · 1 answers · asked by jonathanaljomargonzales 1 in Mathematics

Can somebody help me find all zeros of the polynomial functions or solve the given polynomial equation. Use the rational zero theorem, describe rule of signs, and possibly the graph of the polynomial function shown by a graphing utility as an aid in obtaining the first zero or the first root.

2007-07-11 14:07:19 · 2 answers · asked by dirtyweapons2 1 in Mathematics

2007-07-11 14:03:28 · 4 answers · asked by Grace Y 2 in Other - Science

Hello! This is my last math question to complete and it's driving me crazy! Here it is:

10/(x-2) - 1/2 = 3/(x-5)

If someone could help me I'd greatly appreciate it. Thanks!

2007-07-11 14:00:20 · 5 answers · asked by Jessica S 1 in Mathematics

2007-07-11 14:00:12 · 1 answers · asked by mimizzaby 1 in Chemistry

I was recently prescribed Wellbutrin XL. I am a social drinker. I usually drink every weekend 5-6 drinks (usually beer). I'm scared of the interaction between the two. I have never had a sezier before. Could I still have one? Would I get really sick if I drank this much while taking this medication? Would it just make me sleepy? I'm scared.

2007-07-11 13:58:07 · 3 answers · asked by JJ 1 in Medicine

2007-07-11 13:50:49 · 6 answers · asked by gillybeb 2 in Mathematics

Theres this spider in my basement and I swear he's over one year old. He's not the biggest spider I seen but its the same web and its getting thicker by the month. I fed him a few times off and on...can this really be the same spider?

2007-07-11 13:49:01 · 4 answers · asked by Mergler 4 in Zoology

1. How many times between 12 noon and 12 midnight do the minute and hour hands of a clcok line up exactly?
A. 10
B. 11
C. 12
D. 23
E. 24

2. The instruction on a can of oragnage juice concentrate state that the water should be mixed with the concentrate in the ratio of 3 to 1. If 12 liters of orange juice are needed, how many liters of concentrate need to be bought?

3. In a prehistoric village, rocks, stones, and pebbles were used as money. The relative values of the "coins" were:
1 rock= 7 stones
1 rock= 49 pebbles
If a man used 6 rocks to puchase a hide that cost 5 rocks, 2 stones, and 3 pebbles, how many change was he owed?

4. A job can be done in 25 hrs. by 6 people. How many people would be needed to do the same job in 8 or fewer hours?

2007-07-11 13:41:59 · 5 answers · asked by Celia 4 in Mathematics

2007-07-11 13:41:49 · 14 answers · asked by ■ Jessie ■ 5 in Mathematics

and also in space???

2007-07-11 13:41:10 · 7 answers · asked by Anonymous in Other - Science

2007-07-11 13:40:29 · 5 answers · asked by jacquelinegrebos 2 in Biology

2007-07-11 13:39:35 · 4 answers · asked by Anonymous in Other - Science

I would like to know how to get science and math symbols such as "delta" and "degree" so I can use them in my answers here. Is there anyone out there who can explain this to me in very simple terms? My computer IQ is very low.

2007-07-11 13:34:28 · 5 answers · asked by physandchemteach 7 in Chemistry

1. For a rectangle with area 289 to have the smallest perimeter, what dimensions should it have?

2. The cost of controlling emissions at a firm rises rapidly as the amount of emissions reduced increases. The following is a possible model, where q is the reduction in emissions (in pounds of pollutant per day) and C is the daily cost to the firm (in dollars) of this reduction.

c(q)=4900+90q^2
*What level of reduction corresponds to the lowest average cost per pound of pollutant? (Give the answer to two decimal places.)
*What would be the resulting average cost to the nearest dollar?

3.Hercules Films is deciding on the price of the video release of its new film. Its marketing people estimate that at a price of p dollars, it can sell a total of q copies. What price will bring in the greatest revenue?
q=220,000-10000p copies

2007-07-11 13:24:45 · 3 answers · asked by poncg004 1 in Mathematics

a) 1.08 atm to Torr
b) 693 Torr to atm
c) 218kPa to atm

2007-07-11 13:24:11 · 3 answers · asked by Heather D 1 in Chemistry

I do a lot of kayakin, even when it's raining.
Is it taking a lot of risk?

2007-07-11 13:23:31 · 4 answers · asked by angelus321 2 in Weather

If the heat capacity of an unknown substance is 0.423 J/g oC. how much heat is required to raise the temperature of 15 grams of this substance from 25 degrees C to 50 degrees C.

2007-07-11 13:18:42 · 2 answers · asked by Heather D 1 in Chemistry

i work at a hospital as a security guard and this guy died today and he like vomitied his feces. it was horrible i was just wondering if that has ever happened and what it is called , and i am sure the guy was dead! i had to help bring the body to the morgue

2007-07-11 13:16:03 · 8 answers · asked by undefinedpoet 1 in Medicine