Mathematics - 14 September 2007

5sqrt(2-5y) dy

Thats the fifth root of 2-5y.

I got 1-(x^4)^(9)

but its wrong.

2007-09-14 14:28:22 · 4 answers · asked by Anonymous

Find the Domain and Range of

f(t) = sec(pi*t/4)

Please explain, i'm trying to grasp it.
I know I can find the range and domain by graphing it with my Ti - 89, but how do i figure it out algebralicly.

Thanks


Heres what the solution manual shows as the answer, could you explain what he is doing there? Im lost.
Thanks

http://img207.imageshack.us/my.php?image=mathprob2uf9.jpg

2007-09-14 14:19:24 · 3 answers · asked by Matthew K 2

I did it by dividing 800 by 75 and I got 10.66
The computer says this answer is wrong.
What is the correct answer?

Thank you very much and I will be choosing a best answer tomorrow

2007-09-14 13:59:20 · 14 answers · asked by Anonymous

2007-09-14 13:57:32 · 3 answers · asked by Anonymous

Find the numbers b such that the average value of f(x) = 7 + 6x - 3x^2 on the interval [0, b] is equal to 8.

b = (smaller value)
b = (larger value)

2007-09-14 13:51:25 · 5 answers · asked by Anonymous

What three techniques can be used to solve a quadratic equation? Demonstrate these techniques on the equation "12x2 - 10x - 42 = 0."

I already did completing the square


Thanks everybody

2007-09-14 13:46:34 · 6 answers · asked by crackr 3

find the exact value of the following.

a) cos (3pi/4)

b) cot (5 pi/3)

c) tan (13 pi/4)

please help/explain, thanks

2007-09-14 13:45:58 · 2 answers · asked by rickyricardoiscool 1

The last few posts were really helpful, thanks everyone! BUT two questions still remain:

1) limit as x approaches 0 of: 5x^2Cot^2(4x) (the answer is NOT 0)


2) Limit as x approaches 0 of: 8x^2Sin(9/x) (the answer is NOT 0)


Thanks!

2007-09-14 13:43:49 · 6 answers · asked by Bikki 3

but i was only able to find two x intercepts 2 and 6/5 wen i know that there is suppose to be a third one, because the function hits the x axis 3 times. Can someone varify my answer and tell me wut's wrong.

2007-09-14 13:37:01 · 4 answers · asked by Anonymous

can anyone help please!

Velma jogs 1 lap around the track each day for two weeks. In the third and fourth weeks, she jogs 3 laps each day around the track. During the next two weeks, she runs 6 laps each day. During the fifth and sixth weeks, her goal is to jog 10 laps each day. If this pattern continues, how many laps will she run each day during the seventh and eighth weeks?

2007-09-14 13:33:18 · 10 answers · asked by Jessica 1

I should know this but it's been alomst a year since I've done calculus. So how would I go about solving the limits:

1) limit as y approaches 4 of: ((1/y)-(1/4))/(y-4)


2) Limit as x approaches 0 of: 8x^2Sin(9/x)


3) Limit as x approaches 0 of: (1-cos(2x))/5x^2


Thanks!

2007-09-14 13:15:51 · 6 answers · asked by Bikki 3

Im only in 8th grade, so please dont make the answer complicated...thanks!

2007-09-14 13:06:20 · 2 answers · asked by Nicky 3

12/√5

30/√5

12/√30

13/√40
i answered these already i just wanna kno if i'm right cud u guys help please.
√5/7

15/√12

2007-09-14 13:04:16 · 3 answers · asked by Anonymous

a) Determine the amount of time t it takes for the rock to hit the bottom of the well.
b) Determine the velocity v of the rock as it is hitting the bottom of the well.
c) If the bottom of the well is lined with thick sand so that the rock does not bounce, what is the velocity vf of the rock just after it hits the bottom of the well?

for (a) I got 2.5 seconds..assuming that the free fall speed is 9.8m/s but it seems that this answer is wrong... I can't figure it out.. can anyone help me?

2007-09-14 12:57:19 · 3 answers · asked by Carlos 1

i got y= [(x-3)^1/3]/2
but I'm pretty sure i've messed up the order of operations and im not sure if its supposed to switch to x =...

2007-09-14 12:40:40 · 5 answers · asked by Ar J 2

I copied the problem here.
http://img210.imageshack.us/img210/4301/untitled2gg1.jpg

Thanks for your help.

2007-09-14 12:07:55 · 3 answers · asked by doodee889 1

im looking to verify 2 of my answers here:

there are 4 ice cream flavours and 6 toppings.
how many sundaes are possible using one flavor of ice cream and 3 different toppings?

I got C(4,1)XC(6,3) = 80

B) how many sundaes are possible using one flavor of ice cream and from zero to six toppings.

I got C(4,1) X 6! not too sure about that one

then finally C) how many different combinations of flavors of 3 scoops of ice cream are possible if it is permissible to make all 3 scopps the same flavor.

2007-09-14 12:04:36 · 2 answers · asked by Anonymous

2007-09-14 12:03:18 · 6 answers · asked by KIM M 1

You can view great brain teasers and riddles at http://www.mindchallenger.com New puzzles and answers are posted at the beginning of each month. Try this one. The answer may not be what you think. I will add an EDIT if no one gets it right. Go to the website to find the answer. If not posted, try next month.

An acquaintance tells you she has two children and you ask her if at least one of them is a boy. She says yes. Assuming every birth has an equal chance of being male or female and you have no additional information about the children, what are the chances that both of her children are male?

2007-09-14 12:02:44 · 5 answers · asked by J S 2

2007-09-14 12:02:36 · 2 answers · asked by KIM M 1

From 0 to 1, (x-1)/(x^2+3x+2)dx

2007-09-14 11:49:15 · 4 answers · asked by Anonymous

2007-09-14 11:41:36 · 3 answers · asked by Anonymous

2007-09-14 11:32:50 · 9 answers · asked by JAMES 4

1/ A regulation for riding a certain amusement park ride requires that a child be between 30 inches and 50 inches tall. Which of the following inequalities can be used to determine whether or not a child's height h satisfies the regulation for this ride?

A) | h-10 | < 50
B) | h-20 | < 40
C) | h-30 | < 20
D) | h-40 | < 10
E) | h-45 | < 5

2/ A measuring cup contains 1/5 of a cup of orange juice. It is then filled to the 1 cup mark with a mixture that contains equal amounts of orange, grapefruit , and pineapple juices. What fraction of the final mixture is orange juice?

Please explain as you're solving. Thank you.

2007-09-14 11:30:05 · 3 answers · asked by Anonymous

Three kinds of tickets were sold at a concert. Child tickets cost $5.00, adult tickets cost $15.00 and student tickets cost $10.00. A total of 110 tickets were sold, bringing in a total of $1250.00. If the number of student tickets sold was twice the number of child tickets sold, how many adult tickets were sold?

2007-09-14 11:29:13 · 4 answers · asked by Anonymous

(5 / (w+4)) - 4 = 3 / (w-2)

My answer comes out to w = 1, -1. But -1 isn't correct.

Help? Thanks.

2007-09-14 11:25:55 · 3 answers · asked by labelapark 6

i've been stressing out on this problem. i have to find the square root of 336
plz help me if u can!

2007-09-14 11:25:17 · 15 answers · asked by jiji 1

2007-09-14 11:18:03 · 2 answers · asked by yyakumuck2000 1

If f(n) is O(g(n)) and d(n) is O(h(n)), how can I prove that the summation f(n) + d(n) is O(g(n) + h(n))? It is obvious that this is true, but how do you prove it?

2007-09-14 11:15:08 · 1 answers · asked by jaden404 4

...................... i need a fraction answer please

2007-09-14 11:08:47 · 10 answers · asked by Anonymous