 |
|
|
|
|
|
|
|
|
A quartic polynomial that is a perfect square |
2012-02-05 |
|
From archit:
If P(x)=x^4+ax^3+bx^2-8x+1 is a perfect square then (a+b)=?
Answered by Penny Nom. |
|
|
|
|
|
|
Two sectors of a circle |
2012-02-03 |
|
From Wayne:
I am not even sure what to ask. I have to two lengths of feet and an angle of degrees, and I have to find the area?
**Problem attached
Thanks,
Wayne
Answered by Penny Nom. |
|
|
|
|
|
|
A rectangular block and a sphere |
2012-02-02 |
|
From snehal:
a solid rectangular block of metal 49 cm. by 44cm. 18cm. is melted and formed into a solid sphere, find the radius of the sphere[22/7]
Answered by Penny Nom. |
|
|
|
|
|
|
There is a police officer in pursuit of suspect |
2012-02-01 |
|
From Jay:
There is a police officer in pursuit of suspect. They suspect is driving on a straight road traveling at 79 mph, the officer is 233 yds away, traveling at 92 mph, the suspects car 5 ft long and the officers car is 5.3 ft long, how long will it take to have the front of the officers car, equal to the front of the suspects car down to the tenth of a second.
Answered by Harley Weston. |
|
|
|
|
|
|
If a parallelogram is a cyclic quadrilateral then it is a rectangle |
2012-02-01 |
|
From Kim:
Show that if a parallelogram is a cyclic quadrilateral then it is a rectangle.
Hint: Observe that in a parallelogram ABCD we always have Triangle ABC is congruent to Triangle CDA.
Answered by Robert Dawson and Chris Fisher. |
|
|
|
|
|
|
Properties of real numbers applied to subsets |
2012-02-01 |
|
From Mark:
Hello -
The questions that I have for you is do the properties of real numbers (such as the associative, commutative, identity, inverse, and distributive law) apply to ALL the subsets of real numbers? In other words, do all those properties work for the Natural Numbers? The Whole Numbers? And so on and so forth. I understand that they are all real numbers, but for instance: the identity is whenever you add zero to a number, you get that number back. But does that work with, say, with only the odd numbers? Zero isn't odd so can that property actually apply to JUST the odd numbers? Any consideration would be greatly appreciated!
Answered by Robert Dawson. |
|
|
|
|
|
|
The dimensions of a rectangle |
2012-01-31 |
|
From Dazz:
Hi I was wondering how to find the length of a rectangle if you know the area is 484 square inches And the length is 10 square inches or 22 square inches?
Thanks~Dazz
Answered by Penny Nom. |
|
|
|
|
|
|
Two cars in a race |
2012-01-30 |
|
From Christine:
In a car race, the speed of one car is 120kph and the other car is 105 kph. If the faster car finished the race 20 mins before the slower one, what was the distance of the race? Thanks for the answer and the previous answer to my question.
Answered by Penny Nom. |
|
|
|
|
|
|
A two digit number |
2012-01-29 |
|
From Christine:
Five times the sum of the digits of a two digit number equals the number. If the digits are reversed, it becomes nine more than the original number. What is the original number?
I really don't understand this question, help me please
Answered by Penny Nom. |
|
|
|
|
|
|
Building a tipi |
2012-01-29 |
|
From Lacy:
Hi there!
We are building a tipi for our children. We want to build a large one about 15ft tall with a base of about 15 feet diameter. I am trying to figure out how much canvas we need to accomplish this. I graduated about 20 years ago and am struggling. Please help if you can.
Answered by Penny Nom. |
|
|
|
|
|
|
The volume of a dugout |
2012-01-28 |
|
From Jan:
is there a formula for calculating the cubic yardage removed from a dugout
for example that is forty feet wide by one hundred and twenty feet long by
twelve feet deep with a three to one slope? It is the slope that makes it a
little tricky. Thank you.
Answered by Penny Nom. |
|
|
|
|
|
|
Tons of fill dirt |
2012-01-27 |
|
From Brian:
about how many tons of fill dirt would I need to level a area 30 foot by 30 foot
and 6 foot deep
Answered by Penny Nom. |
|
|
|
|
|
|
The area of a triangle |
2012-01-27 |
|
From mary:
I have a scalene triangle and the base is 33m, side is 52m and the unparallel side is 25m but i drew a dotted line down and that s 20m
how do i figure the area?
thanks
Answered by Penny Nom. |
|
|
|
|
|
|
1 + 3 + 3^2 ...+3^(n-1) = 3^n - 1/2 |
2012-01-27 |
|
From Vicki:
I am trying to find out how to do show how this proof was worked.
Here is the end result 1 + 3 + 3^2 ...+3^(n-1) = 3^n - 1/2
This equation was used to find the number of white triangles in the Sierpinski Triangle
Answered by Walter Whiteley. |
|
|
|
|
|
|
I need to make a 45,000 pound batch of this 80% MgO product |
2012-01-26 |
|
From James:
I have a 55% MgO product and 89% MgO product. I have unlimited pounds of each MgO product. I am looking to make a 80% MgO product. I need to make a 45,000 pound batch of this 80% MgO product.
Answered by Penny Nom. |
|
|
