







The sum and difference of two numbers 
20170320 

Olivia pose la question : The sum of two numbers is 87 and their difference is 29. What are the two numbers Penny Nom lui répond. 





Differentiate y = x^x^x 
20170319 

Nafis pose la question : differentiate y = x^x^x Penny Nom lui répond. 





Is infinite a number? 
20170318 

Divyansh pose la question : Is infinite a number? If yes why as i think that numbers are used for counting but infinite is undeterminable? Penny Nom lui répond. 





Faster than as a percentage 
20170318 

Maximilian pose la question : Hi, i have a strange issue with the phrase "faster than" in percentage, ie. if i have a 10MB/s connection, and somebody has a 7MB/s connection, is it 30% faster or 50% faster.
which ( affirmation, phrase, sentence ) is the right one:
a:) My 10MB/S connection is 50% faster than the 7MB/s ?
or
b:) My 10MB/S connection is 30% faster than the 7MB/s ?
Thanks in Advance, and please if you can teach me why ! Penny Nom lui répond. 





2^a, 2^b, 1^1 and 1^0 
20170317 

Émile pose la question : If you had 2^a = 4 and 2^b = 4 you could assume that a = b right? Yet we can observe that 1^1 and 1^0 both equal 1, yet 1 = 0 isn't true. So if given a log base 1 number 1 the would the answer be 1 AND 0? Penny Nom lui répond. 





Percentage change in productivity 
20170315 

Sunni pose la question : I'm working on a graph and I need to find the percentage of increase from one figure to another. How do I do that? For instance our department started with a workload of 1773 in Jan and ended with 341 in Dec. In addition to that we received 2088 new items from Jan  Dec with an average of 5 workers. How do I find the percentage of increased productivity if any? Penny Nom lui répond. 





Solve 3x^219x14=0 for x 
20170315 

nick pose la question : I'm an 8th grader and am quite confused with this equation:
3x^219x14=0
The answer is:
2/3 , 7
But I'm not sure how to solve for it. Penny Nom lui répond. 





The ratio of two ages 
20170315 

Angel pose la question : The sum of Keith's age and Alan's age is 36. Four years ago, the ratio of Keith's age to Alan's age was 4:3. Find the ratio of their present age Penny Nom lui répond. 





What is the grade of the incline? 
20170312 

Jon pose la question : If I am climbing 16 feet in elevation over 80 feet horizontal. What is the grade of the incline Penny Nom lui répond. 





A regular tetrahedron 
20170312 

Jeramie pose la question : When we have a regular tetrahedron, is it always true that all the angles of the triangles measure 60 degrees? Penny Nom lui répond. 





How much does the fish weigh? 
20170308 

Jeri pose la question : Fish is caught that weighs 5 pounds plus half its weight. How much does the fish weigh? Penny Nom lui répond. 





More on calculating the area (acreage) of a foursided lot 
20170306 

Kerri pose la question :
Can you please show the formula used to calculate areas as provided on this page:
Calculating the area (acreage) of a foursided lot Penny Nom lui répond. 





Exponential form 
20170304 

michael pose la question : I was teaching my student about exponent when we stumbled across this problem.
"write (125)^3 in exponent form"
The problem is with the number "125". I think 125 = (5)^3. But one of my student thought that it is 125= 5^3.
Both of them is equal to 125 but they totally different in structure. I wonder which one is correct and why it is. I am worried if they get this wrong, it might spell problem in the future when we start substituting the numbers with variable.
Thank you very much for reading my question and answering it. Penny Nom lui répond. 





Tons of sand 
20170301 

Elizabeth pose la question : Hello my arena is 132.23 feet width by 132.23 feet length. I need to put 4 inches of sand. How many tons of sand do I need ? Penny Nom lui répond. 





The inside diameter of a silo 
20170228 

JOHN pose la question : I need to find the inside diameter of a cement silo with an outside circumference
118 ft and a wall thickness of 7 inches. thank you John Kerr. Penny Nom lui répond. 

