book Maths Puzzle Numerical Ability

99-4s-6s=-1

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book Other Question

9/2b+1=c. which is NOT a value of b?

a) 1
b)1/2
c)-1/2
d)0
Rationalize the denominator.

Please assist me with this problem.
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√ 25p^7
....r



Actual problem is here
http://www.ccaurora.edu/mat090/Tests/test_chapter_8_files/image030.gif