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To see where the graph is greater than zero, we start by finding where it meets zero. By factorising (x^2 - 7x - 18), we find it equals (x-9)(x+2). The expression equals zero at the points x = 9 and x = -...

Since y is equal to both 5-x and to x+1, we know that 5-x is equal to x+1. We can write 5-x=x+1. Take 1 away from each side: 4-x=x. Then add x to each side: 4=2x. Divide both sides by 2: 2=x. Now we have ...

Finding 51% of 400 is the same as finding 50% of 400, and 1% of 400, and adding them together. Finding 50% of a number is the same as finding half of the number, since half of 100% is 50%. Half of 400 is ...

In order to accurately explore the role of women in medieval society, and in relation to knighthood, it is most effective to look at a combination of primary and secondary sources. Starting with the rise ...

In French the past participles of direct verbs have to agree with the gender or number of their object. For example, ‘I saw him’ translates as ‘je l’ai vu’, but ‘I saw her’ as ‘je l’ai vue’, and 'I saw th...