exam Maths Puzzle Numerical Ability

A temperature of 10°C corresponds to a temperature of 50°F. Also 40°C corresponds to 104°F. Find the linear equation relating F and C.

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can you please help me?

2x^3+3x^2-2x-3

i have no idea where to start except that you need two sets of ()
Can someone please explain this and dumbify it down - thank you so much in advance:

Rationalize the denominator:
_____2______
√[6] - √[5]