 |
|
|
|
|
|
|
|
|
Rewrite the expression in terms of cosine to the first degree |
2008-01-14 |
|
From Jamie:
Hi. Im am having trouble with a problem on my math homework. I need help rewriting the expression in terms of cosine to the first degree.
(sinx)^4(cosx)^2
Answered by Harley Weston. |
|
|
|
|
|
|
Two solutions using the law of sines |
2008-01-14 |
|
From Kate:
I am working on the Law of Sines and I have a problem that says: Find a value for b so that the triangle has 2 solutions.
I am given that A = 36 degrees and a = 5. Now, I learned that for a triangle to have 2 solutions, h < a < b.
BUT...my answer key says the answer is: 5 < b < 5/sin 36. I can't figure out how to make this fit with h < a < b.
Answered by Harley Weston. |
|
|
|
|
|
|
Conditional probability |
2008-01-14 |
|
From Sara:
Hello!
Ian has a photocopier in his office. If the photocopier is working on a certain
day then the probability that it will be working the next day is 0.9.
If the photocopier is not working on a certain day then the probability that
it will not be working the next day is 0.3.
The photocopier is not working on Monday.
(a) Calculate the probability that it will be working on Tuesday and Wednesday.
(b) Calculate the probability that it will not be working on Wednesday.
Could you please draw a tree diagram for this problem.
Answered by Penny Nom. |
|
|
|
|
|
|
x=sint, y=cos2t |
2008-01-14 |
|
From Art:
How do i transform x=sint y=cos2t into a function in terms of x and y
Answered by Harley Weston. |
|
|
|
|
|
|
The surface area of a hemisphere |
2008-01-14 |
|
From Nicholas:
the surface area of a hemisphere is 1062 cm2. What is the radius?
Answered by Penny Nom. |
|
|
|
|
|
|
The side of a heptagon |
2008-01-14 |
|
From Peter:
Find the length of one side of each regular polygon.
heptagon with an apothem of 15mm and the area=758mm2
Answered by Penny Nom. |
|
|
|
|
|
|
The sum of two numbers is 36 |
2008-01-14 |
|
From May:
The sum of two numbers is 36.
Their product is 320.
What are the two numbers?
Answered by Penny Nom. |
|
|
|
|
|
|
How tall is the pole? |
2008-01-13 |
|
From Michael:
If a 25 foot cable is attached to the top of a pole, and that cable
attaches to the ground ten feet away from that pole, how tall is the pole?
The 25 foot cable is the hypotenuse of a right triangle with a base of
ten feet.
Answered by Leeanne Boehm and Penny Nom. |
|
|
|
|
|
|
Oil in a tank |
2008-01-13 |
|
From tanakura:
an oil tank contain 208.3 gallons of oil .whenever the amount of oil drops below 70 gallons,an alarm sound
.if 153.4 gallons are pumped into a delivery truck ,how many gallons must be pumped back into the tank in order to shut of the alarm?
Answered by Penny Nom. |
|
|
|
|
|
|
(303,000,000,000,303x3,300,000,033)/1,000,100,010,001 |
2008-01-13 |
|
From Adrian:
Give the result of the following computation as an integer.
(303,000,000,000,303x3,300,000,033)/1,000,100,010,001
N.B. No calculators allowed
Answered by Penny Nom. |
|
|
|
|
|
|
1.2 as a fraction |
2008-01-12 |
|
From Confused:
i have confused my brain and its driving me crazy i am trying to write 1.2 as a fraction but each time i do it i come out with a different number please help
Answered by Penny Nom. |
|
|
|
|
|
|
Five boys and two girls in a line |
2008-01-12 |
|
From pankaj:
There are 5 boys and 2 girls.In how many ways can they stand in row so that no two girls are together?
Answered by Penny Nom. |
|
|
|
|
|
|
The cube of a number |
2008-01-12 |
|
From Sadie:
can you help me to find out how to cube a number
example (6 cubed / by4) =54 what is cube or how do you cube something
Answered by Penny Nom. |
|
|
|
|
|
|
The perimeter of a figure |
2008-01-11 |
|
From Kassandra:
I am trying to find out the perimeter of a semicircle. I do what the book says
but, I always get it wrong. I usually don't have problems with math until now.
There is half a circle. It shows that the radius of the circle is 4 units.
And then below the half circle there is a square below it. The angles are right angles
and the width is also 4 inches. I get close to the answer but, am usually off.
Answered by Penny Nom. |
|
|
|
|
|
|
The area of a sector of a circle |
2008-01-11 |
|
From Serenity:
A denotes the area of a sector of a circle of radius r formed by the central angle theta.
Find the area A if r=10 meters and theta = 1/2 radians.
Answered by Penny Nom. |
|
|
