The Answer would be 13.333333333333% or 13.3%.
You take out the squares inside of the radicals. you can do this by factoring each number. 90 is a multiple of 3x3x2x5 and 40 is 2x2x2x5. now you take out pairs. so its (3√2x5)/(2√2x5). then you cancel out the √2x5 and you're left with 3/2. :)
X = 1/cos(30)
X = 1.154700538
X = 1.2 (nearest tenth)
5 m/s · 12 s = 5 m · 12 = 60 m
Answer: in 12 seconds that car has gone 60 metres.
2a^2+4a+1 is equivalent to 4a+4/2a*a^2/a+1