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# Tutor profile: Sameer H.

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Sameer H.
Tutoring experience for 6 years
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## Questions

### Subject:Basic Chemistry

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Question:

Balance the equation: HCl + Mg(OH)_2 --> MgCl_2 +H_2O

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Sameer H.

First count the number of atoms of each element. Always balance the most common elements like H,O,C at the end. Balance Cl and Mg first. Both sides have only 1 Mg so they are balanced. The left side only has 1 Cl while the right has 2. Hence multiply HCl by 2. This gives us 4 H's on the left and only 2 on the right. As a result, multiply H_2O by 2. This also balances the O's. The result is: 2HCl + Mg(OH)_2 --> MgCl_2 + 2H_2O

### Subject:Calculus

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Question:

Use the chain rule to calculate derivative of: y=(5x+1)^3

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Sameer H.

This rule involves taking the derivative of the terms inside the bracket, multiplying it with the power of the term and original term with its power decreased by 1. dy/dx=3(5)(5x+1)^2

### Subject:Algebra

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Question:

Find the equation of the line A that passes through the point ( 2 ,1 ) and is perpendicular to the line B 2x + y = 4 .

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Sameer H.

Line B has a gradient of -2. Since the two lines are perpendicular, the products of their gradient would be -1. mA*mB=-1 mA*-2=-1 mA=0.5 Use equation y-y1= mA(x-x1) y1=1, x1=2 y-1= 0.5(x-2) y-1=0.5x-1 y=0.5x :Line A

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