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Expand and simplify fully 4(x - 2) - 2(3 - 5x)

Firstly, expand out the first bracket - 4x - 8 - 2(3 - 5x) Then the second bracket (remember a minus x a minus = a positive) - 4x - 8 - 6 + 10x Then finally group the like terms together - 4x + 10x - 8 - 6 =...
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Answered by Calum R. • Maths tutor
6188 Views

Explain the diffusion process of gas exchange in the lung during respiration

Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs. Blood travelling to the lungs is deoxygenated and instead of oxygen, carbon dioxide is bound to the red blood cells. Th...
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Answered by Calum R. • Biology tutor
14103 Views

Find the period of a wave given that it has a speed of 200m/s and a wavelength of 2m

The equation for finding the period of the wave is the reciprocal of the frequency hence th eperiod T =1/f substitute this into the wave speed equation v=f x lambda solve for f f = v/ lambda f= 200/ 2 f= 100...
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Answered by Zubaydah J. • Physics tutor
3627 Views

Why are transformers used in the National Grid?

The National Grid is how electricity is distributed from suppliers to consumers (commercial or private household). Power stations produce power in the region of Mega Watts (the order of millions of watts) an...
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Answered by Mike R. • Physics tutor
19360 Views

Nella mia città, ci sono due grandi problemi: 1)vicino a casa mia ci sono solo contenitori per la carta e il vetro. Non è possibile riciclare la plastica; 2)c’è molta gente che non lavora. La maggior parte dei disoccupati è giovane. What are the problems?

Possibilities are A homelessness B crime C air pollution D youth violence E unemployment F recycling First of all, I would ask if they know the meanings of the words. Then I would ask them to identify and un...
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Answered by Giovanni N. • Italian tutor
3992 Views