exam Maths Puzzle Numerical Ability

We have been trying to figure this out and I fear we are over-thinking it. Therefore making it much more complicated than it actually is..Please help.

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Science and medicine. Celsius temperature readings can be converted to
Fahrenheit readings using the formula . F= 9/5 C +32 What is the Fahrenheit
temperature that corresponds to each of the following Celsius temperatures: -10, 0, 15, 100? need steps and answer
Factor
x^2- 6x + 8