Substance A decomposes at a rate proportional to the amount of A present. a) Write an equation that gives the amount A left of an initial amount A, after time t. b) It is found that 8 lb of A will reduce to 4 lb in 4.4 hr. After how long will there be only 1 lb left? a) Choose the equation that gives A in terms of An, t, and k, where k> 0. - kt O A. A(t) = A0e B. A(t) = A, e kt kt O C. A(t) = A - kt O D. A(t) = A0 b) There will be 1 lb left after 0.1575 hr. (Do not round until the final answer. Then round to the nearest whole number as needed.)
Substance A decomposes at a rate proportional to the amount of A present. a) Write an equation that gives the amount A left of an initial amount A, after time t. b) It is found that 8 lb of A will reduce to 4 lb in 4.4 hr. After how long will there be only 1 lb left? a) Choose the equation that gives A in terms of An, t, and k, where k> 0. - kt O A. A(t) = A0e B. A(t) = A, e kt kt O C. A(t) = A - kt O D. A(t) = A0 b) There will be 1 lb left after 0.1575 hr. (Do not round until the final answer. Then round to the nearest whole number as needed.)
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Transcribed Image Text:Substance A decomposes at a rate proportional to the amount of A present.
a) Write an equation that gives the amount A left of an initial amount An after time t.
b) It is found that 8 lb of A will reduce to 4 Ib in 4.4 hr. After how long will there be only 1 lb left?
a) Choose the equation that gives A in terms of An, t, and k, where k> 0.
- kt
O A. A(t) = A, e
B. A(t) = A, e kt
kt
OC. A(t) = A,
- kt
O D. A(t) = A0
b) There will be 1 lb left after 0.1575 hr.
(Do not round until the final answer. Then round to the nearest whole number as needed.)
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