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w=3(2a+b)-4 
w+4=3(2a+b) 
Expand 3(2a+b) = 6a+3b 
w+4=6a+3b 
w+4-3b=6a 
(w+4-3b)/6=a 


Maths

Make a the subject of w=3(2a+b)-4

Hi, there’s insignificant information to answer the question 

Work out the value of her house at the start of 2017

Copper is a better conductor than graphite for electricity due to its lattice structure with free delocalised electrons that can carry the energy across the structure, whilst graphite is still able to conduct electricity, it is not as strong of a conductor as copper. Although copper has a high melting and boiling point, the bonds in copper take less energy to break. 

Graphite has a very high melting and boiling point because the strong covalent bonds that hold the carbon atoms together in the layers require a lot of heat energy to break. The layers slide across each other 

Chemistry

In terms of structure and bonding, what are the similarities and differences of copper and graphite

This question cannot be answered as there is insufficient information 

3n^2

Make 3thetha + 20 = y 
So you’ll have: 4root3 siny = 4 cos y 
Then divide both sides by cos y 
So 4 root 3siny/cos y = 4cosy/cosy 
Siny/cosy = tan y and cosy/cosy = 1 
Therefore: 4root 3 tan y = 4 
Divide both sides by 4 
So: root3 tan y = 1 
So tan y = 1/root3 
Change your intervals: 0<theta<180 => 0<3theta<540 => 0<3theta +20<560 

y= 30,210,390,570

Let y = 3 theta+20 
Theta = (y-20)/3 

So plug each value into (y-20)/3 

theta = 3.3, 63.3, 123.3, 183.3

Take any value under 180 degrees. So reject 183.3 degrees 

Find, to 1 decimal place, the values of θ in the interval 0 ⩽ θ ⩽ 180° for which 4root3 sin (3theta + 20degrees) = 4 cos (3theta+ 20degrees).

11+ Entrance Exams

10th term for 3n+2

Find 7s-2t when S=4 and t=-4

20 x 2 = 40 
8 x 5 = 40 

Find a common multiple of the two numbers

Therefore: they both stop after 40 mins so at 12:40

Q5. The 90A bus and the 95B bus both stop at the bus station at 12:00. 90A stops there  every 20 minutes and 95B stops there every 8 minutes. When do they both stop there  again?

Hiral Haria

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De Montfort University, Leicester

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