exam Maths Puzzle Numerical Ability

please help solve the following:

(x+3)^3/2 = 8


thanks

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exam Other Question

can someone please help me with this problem:

Which of the following is a line perpendicular to y = 1/2x + 4 ?

a. y = 1/2x - 1/4
b. y = 2x - 4
c. y = 2x - 1/4
d. y = -2x
By adding or subtracting, how would you write this in lowest terms?

5/3x+7/3x