exam Maths Puzzle Numerical Ability

Solve:
a) 25(^2x+1)-5=120
b)sqrt2x^2-sqrt2=0
c)2^x=sqrt32
d) -8^0+(-2/5)^-2

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exam Other Question

please factor the following and explain, thank you
x^2-25 over x+5

and
4y^2+16y+16
Heres the question:
A farmer wants to buy 100 animals for $100.00 (must buy at least one of them)

Horses-$5.00
Cows-$3.00
Chicks-.50

How many horses,cows and chicks does the farmer need to have 100 and 100.00?