book Maths Puzzle Numerical Ability

is 0.282882888... a rational number?

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book Other Question

solve triangle ABC using the given info...

A=62 deg, B=34 deg, b=6... and that concludes my questions on solving triangles, i really need help. thank you so much!
CAN YOU PLEASE GIVE ME THE ANSWER FOR 7a to the third power-2a squared+6-7a squared+2a-4