







Filling holes with stone dust 
20200730 

From Zach: I’m looking for amount of stone dust needed for thirteen holes with
a 3ft depth and 12in diameter with a 4x4 post. I would need the
measurement in KG. Answered by Harley Weston. 





A tank, 5/9 full of water 
20200728 

From Nat: A rectangular tank contains 1200cmsquare of water when it is 5 out of 9 full . Its base area is 80cmsquare . Find the height of the tank. Answered by Penny Nom. 





Five rational numbers between 4 and 3 
20200728 

From Priyanshi: Five rational numbers between 4 and 3 Answered by Penny Nom. 





x+sin(x) 
20200724 

From adm: f(x)=x+sin(x)
to evaluate f(30)
use radians only or degrees Answered by Harley Weston. 





Choosing 4 balls from 9 
20200722 

From sandiso: What is the probability associated with each possible random sample of size 4 from the population consisting of these nine balls Answered by Penny Nom. 





why percents can be helpful 
20200702 

From THERESA: why percents can be helpful Answered by Penny Nom. 





4sin(2x)cos(2x)+1=0 
20200702 

From Sheila: 4sin(2x)cos(2x)+1=0 Answered by Penny Nom. 





Some strings of 4 digits 
20200626 

From Judy: I wrote previously and need more help. I need to generate a list of 4 digit. Numbers using 09 with no repetitions
I know that there is a 6 followed by a 2. Order does matter
Thank you in advance for your help. Answered by Penny Nom. 





Scale factor 
20200626 

From Kinza: Hi, my question is The perimeter of a triangle is reduced from 75cm to 20cm. What is the linear scale factor? Answered by Penny Nom. 





A word problem involving linear equations 
20200622 

From Allie: The length of a rectangular swimming pool is p m and its width is q m. Its given tht the length of the swimming pool is twice its with. if the perimeter of the swimming pool is 150 m, find the values of p and q
this is in the chapter linear equations Answered by Penny Nom. 





A word problem with fractions 
20200621 

From Sthantsa: I'm stuck with this question, I don't know where to begin because
i really don't Know where to start.
Jessie and Thulani each has a sum of money. Jessie’s amount is 2/5
that of Thulani’s. If Thulani were to give Jessie R198, then his
remaining amount will be 6/8 that of Jessie’s amount.
How much does Jessie have originally?? Answered by Penny Nom. 





1 square cm is 100 square mm 
20200619 

From macie: explain why the conversion factor for cm squared to mm squared is 100 ,and not 10 Answered by Penny Nom. 





390 as a percentage of 800 
20200618 

From Yug: What percentage is 390 grams of 800 grams? Answered by Penny Nom. 





The substitution method 
20200610 

From Hardebolar: simultaneous equation by substitution method
.ab=2/3 a+b=1 2/3 Answered by p. 





Working backwards 
20200605 

From Jill: Emma has a bunch of grapes (1)/(2 ) of it she gave it to her friend and (3)/(4 ) of the remaining grapes she gave it to Gina. There are 4 grapes remaining. So how many bunch of grapes to begin with? Answered by Harley Weston. 

