190 = 200^b, make b the subject

b =

Step-by-step explanation:

Using the rule of logarithms

log ⇔ nlogx

Given

190 = ( take the natural log ln of both sides )

ln190 = ln = bln200 ( divide both sides by ln200 )

= b

t = 3

step-by-step explanation:

put t = 3 in this expression :

(3²-1)(3²-2)(3² - 3)(3² - 4) = 8×7×6×5 = 56×30 = 1680

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step-by-step explanation: