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z = 3i(7-i)(i+1)= 3i(7i-i+7-i² )= 3i(6i+8)= 18i² +24 (1 method mark)= 24i-18 (1 method mark)k=18 (1 answer mark)

Surds are irrational numbers, (numbers which cannot be expressed as fractions), and normally shown as a number instead a square root, but the number itself isn't a square. For example root 3 is a surd, wh...

v = 2𝜋R/T where R is the orbital radius, T is the time period.R = radius_of_earth + height_of_orbit = 6800km + 400km = 6800km = 6.8×10⁶m.T = hours_in_day/number_of_orbits_in_day = 24/16 hours =...

It controls what enters and leaves the cell.

As we travel along the period the nuclear charge increases, this increases the grip the nuclei of the atom has on the electrons. As they are on the same period they experience almost the exactly the same ...