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BIDMAS 

Following BIDMAS, multiply the bracket out before the addition of the 2y.

3y(5y+3) = 15y²+9y 

adding the 2y gives the calculation of 15y² + 9y +2y = 15y<...

Meiosis is a specific type of cell division. Unlike mitosis, which results in 2 identical copies of the mother cell, meiosis creates 4 daughter cells each containing half of a normal gentic material (we r...

32 mmol = 0.032 mol

75cm³ = 0.075dm³

n = c x v    so   c = n / v

c = 0.032mol/0.075 dm³ = 0.426moldm^-3

pH = -log[H+]

pH = -lo...

Cardiac muscle is myogenic i.e has the ability to contract naturally, without external stimuli, such as action potentials arriving via nerves. For the whole heart to contract in an organi...

The First World War displayed the ineffectiveness and under preparation of the Russian army as by 1917 there were c.4 million Russian soldiers dead and c.3 million wounded; this caused resentment towards ...