exam Maths Puzzle Numerical Ability

Please help me do this geometry two column proof!
If X-1=x-10/2, then x=4

THANK YOU!!

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exam Other Question

a) solve equation y = -16t + (v*t*sin( heta))+ h for t in terms of y, v, h, and heta.

b) use result from a) to calculate t when h=3, v=25, and heta=0,5,10,...,60 You are looking for a tank to hold 5000 gallons. You have decided to place the tank inside an exisiting building , but the space in the building only allows for a maximum diameter of 12 foot. How tall will the tank need to be ????