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Sophie accidentally puts her hand on an open flame, she immediately withdraws her hand. This is an example of a reflex reaction. Describe how a reflex reaction is coordinated.

Reflex reactions are subconscious, they bypass the brain. Receptors detect a sensory stimulus, in this case- pain. Receptors stimulate sensory neurons, creates an electric impulse which travels to the spi...

AL
Answered by Amelia L. • Biology tutor
1982 Views

Expand the following quadratic (x+3)(2x-2)

When expanding quadratics, the ‘smiley face’ method is the easiest one to follow. Do each term individually. The lines you draw between the terms will resemble a smiley face. Ensure that there are 2 lines...

JL
Answered by Jordan L. • Maths tutor
3532 Views

Solve x^2 -4x=12

1:Firstly, put all the terms on the Left Hand Side, leaving only 0 on the right hand side2: Factorise the equation a) think about what multiples can be used to calculate -12 1*-12=-12 and -112=-12 2

EM
Answered by Elisabeth M. • Maths tutor
2955 Views

A football pitch has a length of the xm. Its width is 25m shorter than the length. The area of the pitch is 2200m2. Show that x2 - 25x - 2200 =0 and work out the length of the football pitch.

Draw rectangle with length x and width (x - 25)show that area = length * width = x(x -25) = x2 - 25xx2 - 25x = 2200x2 - 25x -2200 = 0This cannot be factorised therefore must use quadratic equation: x = [-...

SO
Answered by Sophie O. • Maths tutor
3477 Views

Ethanol, CH3CH2OH, can be converted into a carboxylic acid with two carbon atom. Name the carboxylic acid formed from ethanol and draw its structure. Show all bonds between atoms.

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