exam Maths Puzzle Numerical Ability

Can someone direct me:

5x^2 = 100

Thank you so much.

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Find the slope of the line through the given points.
(2,1) (2, 7) C and Y candy Company mixes candy that costs $6.00 per kg with candy that costs $4.50 per kg. How many kilograms of each are needed to make a 3 kg box that costs $15.00?