







A one foot rise in water level 
20190915 

Stuart pose la question : If a lake were to rise one foot  how many linear feet would it spread onto the shore line ?
What is the correlation  1 foot of a rise = 10 feet onto the shore ? Does it depend on the lake
size  if so Lake Ontario in Canada. Penny Nom lui répond. 





The amount of concrete in a foundation 
20190911 

Lorinda pose la question : How do you calculate ( in cubic yards) how much concrete is needed for the foundation of a rectangular building 40 ft by 85 ft if the foundation walls are 8 inches thick and 7 ft 6 inches high? Penny Nom lui répond. 





What is 5 squared? 
20190910 

Pori pose la question : What is 5 squared? Penny Nom lui répond. 





The number of integers that satisfy some conditions 
20190910 

Ryu pose la question : Using only the digits 0 1 2 3 4 5 6 7 8 9 without repetition, how many integers are:
(a) Greater than 999, less than 10,000, start with an even digit and are even?
(b) Greater than 999, less than 10,000, start with an odd digit and are odd?
(c) Greater than 999, less than 10,000, start with an even digit and are odd?
(d) Greater than 999, less than 10,000, start with an odd digit and are even? Penny Nom lui répond. 





Problem solving 
20190908 

Arunsi pose la question : When a fifth of a certain number is added to 3 the result is 17. What is the number? Penny Nom lui répond. 





Vectors 
20190906 

Kayla pose la question : Hi!
Due to time constraint issues, we skipped vectors in PreCalc last year. However, I'm attempting to complete my AP Physics summer homework and there are 3 problems with vectors. As I explained, I have no idea even where to begin and as such I need some help.
Problem 1:
A plane flying at 90° at 45 m/s is blown toward 0° at 62 m/s by a strong wind. Find the plane's resultant velocity.
I have tried all sorts of online calculators but none are providing me with a formula I can use to solve this problem on my own.
Problem 2:
If you walk 367 m North and 785 m West what is your total displacement from your original location?
What is the problem asking for when it says displacement?
Problem 3:
A plane travels on a heading of 127.0° at a velocity of 25 km/hr. What are the horizontal and vertical components of the plane's velocity?
As you know already, I have never done vectors so I don't know what horizontal and vertical components of velocity are.
Thank you So Much for your help!! I am struggling!!
 Kayla Penny Nom lui répond. 





Using the Laws of Exponents 
20190906 

Samiya pose la question : i have been struggling with the laws of exponents so im having trouble with this question. the
question is to write (b*exponent2*c)(b*exponent5*c*exponent4*) Penny Nom lui répond. 





Average savings 
20190906 

Puchu pose la question : A student was saving an average of £2 per week for 25 weeks. He then found a part time job and after total of 45 weeks his average savings rose to £9 per week
How much did he save over 20 weeks after finding job? Penny Nom lui répond. 





The volume of a berm 
20190906 

John pose la question : I need to construct a berm:
8' tall
5' across the top
20' at the base
125' long
How much soil will I need Harley Weston lui répond. 





How was math created? 
20190903 

Phu pose la question : How was math created? Harley Weston lui répond. 





A negative minus a negative 
20190903 

Maggie pose la question : Why is a negative minus a negative a negative? Penny Nom lui répond. 





Can one equation with two variables be solved algebraically? 
20190830 

Don pose la question : Can one equation with two variables be solved algebraically? Penny Nom lui répond. 





400 in 7.5 billion 
20190828 

Emma pose la question : What is a better way to express 400 in 7.5 billion?
My daughter has a rare condition, I want to know the answer to say “she is 1 in a ...” Penny Nom lui répond. 





David Is 6 years older than his sister Delia 
20190827 

Abigail pose la question : David Is 6 years older than his sister Delia. In 10 years the sum of There age 52. how old are David and Delia today Penny Nom lui répond. 





A flat top cone 
20190825 

Mary pose la question : I want to make a paper model of a flat top cone with the radius of the base is 12.5 cm and the radius of the apex is 7 cm.The height is 15 cm and the radius of the apex is 5 cm. The height is 15 cm.
Can you help me with the angle and construction, please?
Thanks. Penny Nom lui répond. 

