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A rectangular frame is made from 5 straight pieces of metal with height 5m and length 12m. One of the pieces of metal goes through the diagonal of the rectangle. The weight of the metal is 1.5 kg per metre. Work out the total weight of the metal

Firstly, I would suggest that we draw a diagram to visualise the problem. Using the diagram and knowledge of rectangles, you can see that the rectangle is made of two right angled triangles. Thus we can use ...
CB
Answered by Charlie B. • Maths tutor
18689 Views

Expand and simplify (3x + 2)(4x - 3).

Firstly, to expand the brackets, we can use the FOIL method to multiply them out. F irst - multiply the first numbers of each bracket. 3x * 4x = 12x^2 O uter - multiply the outer numbers of each bracket. 3x ...
VY
Answered by Vikki Y. • Maths tutor
7710 Views

Explain how ciliary muscles and elastic fibres change the shape of lens to a distant object

if you are looking at a far away object, your eyes don’t need to refract the light too much in order to focus it onto the retina. So in this case the lens shape should be flat instead of fat. And how this ha...
RR
Answered by Ryan R. • Biology tutor
3423 Views

Alex wants to buy a new phone. It costs £280. Alex’s weekly wage is £420. He saves 15% of his wage each week. How many weeks does it take Alex to save enough money to buy the phone?

Total wage each week= £420. In one week, he saves 15% of this: 15% of 420 is 0.15 x 420 = £63. So he saves £63 in one week. To calculate the total number of weeks it takes to save up for the phone, divide 28...
AM
Answered by Alexandra M. • Maths tutor
4582 Views

Briefly describe and explain one study in which plasticity of the brain has been investigated. (4 marks)

Maguire et al. (2000) looked at MRI scans of London taxi drivers. These drivers had to undergo extensive navigational training, known as ‘The Knowledge’ before they became drivers. It was found that, compare...
MH
6765 Views