The half-life of a certain substance in an aquatic environment is about 150 years. Which of the following exponential functions best models the amount Act), in grams, of the substance that remains t years after 200 grams of the substance is applied to the aquatic
environment? (The half-life is the length of time needed for an amount of the substance to decrease to one-half of that amount.) HELP

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

you can download it here

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.

the terms of a geometric sequence can be found by beginning with the first term and multiplying by the common ratio repeatedly. a recursive formula for a geometric sequence with common ratio r is given by an=ran−1 a n = r a n − 1 for n≥2 n ≥ 2 .

step-by-step explanation:

answer is because 4×10=40

and 98×4= is 392

40,392