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y is proportional to x² so this means y = A*x² for some constant A.

When y = 75, x = 5. Put these values in the formula above to find A:

75 = A*25

Since the diameter is 130cm, the radius is half of this, so it is 65cm

Area is Piradius². This means the area is Pi(65cm)²

This means the area...

Take for example, the equation

13a   +   6a²   =   −6

rearrange the questions into the form         ax²+bx+c=0

This is the full question:

There are n sweets in a bag. 6 sweets are orange. The rest of the sweets are yellow. Hannah takes a sweet out of the bag at random. She eats the sweet and th...