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By default it is always better "vous" which is the polite form for "you", which you would use for a teacher, while "tu" should only be used with friends and close family memb...

In English we only use genders for people. In French everything has a gender and knowing it will allow you to use the right article, pronouns and ending of adjectives.
There are no absolute rules on ...

16y³ + 9x²y - 54x= 0 
a) Differentiate the terms separately dy/dx(16y³ + 9x²y - 54x) = dy/dx(16y³) + dy/dx(9x²y) - dy/dx(54x) ...

Aggregate demand is the total demand in the economy. It is calculated as C+I+G+(X-M), where C is consumption, I is investment, G is government spending, X is exports and M is imports. The value of all is ...

So firstly, you need to find two numbers that multiply to make 6 and add to make 5 Make a list of numbers that multiply to make 6 i.e. 16 and 32
So you can either have (x 6)(x 1) OR...