exam Maths Puzzle Numerical Ability

Solve for x:
a)(2x-1)^1/2=sqrt3
b)8^(2x)+8^x=0
c)(x+3)^(2/3)=4

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exam Other Question

What is the critical value for a one-tailed hypothesis test in which a null hypothesis is tested at the 5% level of significance based on a sample size of 25?
A) 1.708
B) 1.711
C) 2.060
D) 2.064
E) None of the above I need to find the rational exponent equation L = 2.43*W^0.3326 to estimate the wingspan L in feet fo the bird. Weighs W pounds I need to include the wingspan of a peacock 6Ft. and weight of 13 pounds. How would I work this problem correctly?