## O-Level Additional Math

### Re: O-Level Additional Math

Hi there,

I need a private tutor, preferably a male with good experience and credentials to coach my son for A Math ( IP ) who is currently in Year 4.

Kindly pm me.

Thanks.

I need a private tutor, preferably a male with good experience and credentials to coach my son for A Math ( IP ) who is currently in Year 4.

Kindly pm me.

Thanks.

### Re: O-Level Additional Math

Hi I can't find where to put this question, this is a sec 2 maths question, can someone kindly help me with this, thank you!

(a) Solve the following inequality:-

4x - 3

------- < 5x + 2

7

(b) Write down the smallest integer that satisfies this inequality

(a) Solve the following inequality:-

4x - 3

------- < 5x + 2

7

(b) Write down the smallest integer that satisfies this inequality

- EconsPhDTutor
- OrangeBelt
**Posts:**39**Joined:**Sat Jan 23,**Total Likes:**1

### Re: O-Level Additional Math

S-H wrote:Hi I can't find where to put this question, this is a sec 2 maths question, can someone kindly help me with this, thank you!

(a) Solve the following inequality:-

4x - 3

------- < 5x + 2

7

(b) Write down the smallest integer that satisfies this inequality

(4x - 3) ÷ 7 < 5x + 2

⇔ 4x - 3 < 35x + 14

⇔ - 17 < 31x

⇔ - 17 ÷ 31 < x

The solution is x > -17/31.

The smallest integer that satisfies this inequality is 0.

Hope this helps and feel free to ask for any clarifications.

- Dr. Choo Yan Min

www.EconsPhDTutor.com

**If you found this answer helpful, then please help me out by spreading word of my services. I’m a new tutor in Singapore so I need some help getting word out! Thank you!**

- questionable_i
- BrownBelt
**Posts:**535**Joined:**Sat Oct 10,**Total Likes:**1

### Re: O-Level Additional Math

Can anyone help me with this question?

Evaluate 2^x/2^4=2^1/2^(2y-2)

Thank you in advance. I need the answer ASAP.

Evaluate 2^x/2^4=2^1/2^(2y-2)

Thank you in advance. I need the answer ASAP.

- kennethTutor
- OrangeBelt
**Posts:**39**Joined:**Mon Jul 13,**Total Likes:**2

### Re: O-Level Additional Math

Applying a^m / a^n = a^(m - n),questionable_i wrote:Can anyone help me with this question?

Evaluate 2^x/2^4=2^1/2^(2y-2)

Thank you in advance. I need the answer ASAP.

2^x/2^4 = 2^1/2^(2y - 2)

2^(x - 4) = 2^(1 - (2y - 2))

2^(x - 4) = 2^(3 - 2y)

Comparing the indices on both sides,

x - 4 = 3 - 2y

x = 7 - 2y

I think this is probably a simultaneous equation question. You need another equation to solve for x and y.

- KSP2013777
- OrangeBelt
**Posts:**92**Joined:**Fri Dec 28,

### Re: O-Level Additional Math

I need help with this question part (ii). Can somebody please help. Thank you

- KSP2013777
- OrangeBelt
**Posts:**92**Joined:**Fri Dec 28,

### Re: O-Level Additional Math

I need help with this question part (ii). Can somebody please help. Thank you

- kennethTutor
- OrangeBelt
**Posts:**39**Joined:**Mon Jul 13,**Total Likes:**2

### Re: O-Level Additional Math

Use the double angle formula: cos 2β = 2 cos^2 β - 1KSP2013777 wrote:I need help with this question part (ii). Can somebody please help. Thank you

Make cos β the subject.

Because of the square root, there will be two possible answers (one positive and one negative).

Since 2β and α are in the same quadrant, and sin α is negative and tan 2β is positive, both angles are in the fourth quadrant (between 270° and 360°).

Angle β should be between 135° and 180° (2nd quadrant). Thus we expect cos β to be negative.

Ans should be -√(7/8)

- KSP2013777
- OrangeBelt
**Posts:**92**Joined:**Fri Dec 28,

### Re: O-Level Additional Math

Thank you, Kenneth Tutor.

Can you help me with another question, Please?

Thank you.

Can you help me with another question, Please?

Thank you.