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Re: Lower Secondary Mathematics
Posted: Mon Apr 11, 2016 9:34 pm
by Sruthi
can anyone please help me with this question.thank you in advance
Re: Lower Secondary Mathematics
Posted: Mon Apr 11, 2016 9:39 pm
by Sruthi
-can you please help with question also. Advanced thank you friends
Re: Lower Secondary Mathematics
Posted: Tue Apr 19, 2016 8:32 pm
by Jmaths.SG
Re: Lower Secondary Mathematics
Posted: Wed Apr 20, 2016 4:39 pm
by questionable_i
Can anyone help me with this question.
1. The sine of an angle is 0.7420. Give two possible values for the angle in degrees.
Answer: ______________ or ______________
Re: Lower Secondary Mathematics
Posted: Thu Apr 21, 2016 9:56 pm
by Jmaths.SG
questionable_i wrote:Can anyone help me with this question.
1. The sine of an angle is 0.7420. Give two possible values for the angle in degrees.
Answer: ______________ or ______________
sin (angle) = positive, when 0 < angle < 180
sin (angle) = negative, when 180 < angle < 360
Since sin (angle) = 0.7420 -> positive
Both angles must be between 0 to 180.
sin^(-1) 0.7420 = 47.9 deg (first ans)
180 deg - 47.9 deg = 132.1 deg (second ans)
Re: Lower Secondary Mathematics
Posted: Sun May 01, 2016 4:05 pm
by tankee
Kindly help with the following qn, thanks.
Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution
Re: Lower Secondary Mathematics
Posted: Sun May 01, 2016 4:28 pm
by Future Academy
tankee wrote:Kindly help with the following qn, thanks.
Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution
Hi, is there any typo error in the question?
I am able to find the solution, which is x= 9.5 and y=-14.
If the question was to solve
y = 2x + 5
y = 2x - 33
or
y = -2x + 5
y = -2x - 33
then there is no solution
working:
sub. y = 2x+5 into the second equation,
2x+5=2x-33
5=-33 (Not a valid equation)
so no solution.
Please us know if you need further help, the tutors in our centre (who are IP/GEP/RGS/NYGH/ACJC teachers) are able to help you.
Re: Lower Secondary Mathematics
Posted: Sun May 01, 2016 10:14 pm
by Sharmum
Need help with the following questions:-
1) 10f2 - 15f = 0
17g + 45
2) g2 + ----------- = 5
2
Not sure how to place the superscript of square thus f2 and g2.
Question 2 is truncated.
Anyone can tell me how to upload the in pic? Cos has reduced size many times and change from bmp to jpg and etc still cant post.....
Re: Lower Secondary Mathematics
Posted: Sun May 01, 2016 11:26 pm
by tankee
Future Academy wrote:tankee wrote:Kindly help with the following qn, thanks.
Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution
Hi, is there any typo error in the question?
I am able to find the solution, which is x= 9.5 and y=-14.
......
likewise. But since it has been a while, I thought better seek help to be sure just in case it isn't a typo.
thanks.
Re: Lower Secondary Mathematics
Posted: Tue May 03, 2016 9:03 am
by Jmaths.SG
tankee wrote:Future Academy wrote:tankee wrote:Kindly help with the following qn, thanks.
Without drawing the graphs, explain why the simultaneous equations
y = -2x + 5
y = 2x - 33
have no solution
Hi, is there any typo error in the question?
I am able to find the solution, which is x= 9.5 and y=-14.
......
likewise. But since it has been a while, I thought better seek help to be sure just in case it isn't a typo.
thanks.
A quick sketch of the graph will show that there is a solution.
I believe that it's a typo, and it probably is on either of the gradient/x-coefficient of the 2 equations.
The explanation should be because the gradient of the lines are the same (-2 OR 2; unable to determine due to typo), that means the 2 equations are parallel to each other, and therefore will never meet each other. => no solutions.