book Maths Puzzle Numerical Ability

please help me with this?

0.4 (a+2) =2

will you explane it to me please?

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Hi
I have this hw due tomorrow. I really need the solution to this problem ASAP.
Thanks

Question:

let x,y belonging to Rm be fixed vectors. COnsider the
function
f(theta) can someone solve for T please
T=6.23*10^8/yz if y=3.8*10^4 and z=2.57*10^3
MY ANSWER but i dont think its right T=6.37927503583862