lanakay2006
10.04.2020 •
Mathematics
Element X decays radioactively with a half life of 9 minutes. If there are 960 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 40 grams?
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Ответ:
f ( t ) = t² + 12 t - 19
( t² + 12 t + 36 ) - 36 - 18
( t + 6)² - 54
Part B : The vertex ( - 6, -54 ).
This is the minimum, because the parabola is open up ( a > 0 ).
Part C : The axis of symmetry t = - 6.