Compare the decimals 18.8 and 18.80. which comparison is correct? a. 18.8 = 18.80 b. 18.8 < 18.80 c. 18.8 > 18.80

It's A.

Step-by-step explanation:

18.8 = 18.80 are the same. The 0 in the 18.80 means there are  zero hundredths and that is understood in 18.8.   The reason why you would write 18.80 rather than 18.8 as an answer to a question is if the question required that you  round the answer to the nearest hundredth. If the result was say

18. 802 for example then you would write 18.80 to the nearest hundredth.

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