book Maths Puzzle Numerical Ability

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)

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book Other Question

were can i see the problems to 5-8 page 251 and 247? please help me with this?

0.4 (a+2) =2

will you explane it to me please?