The derivative of the function A is given by A′(t)=2+9e0.4sint , and A(1.2)=7.5 . If the linear approximation to A(t) at t=1.2 is used to estimate A(t) , at what value of t does the linear approximation estimate that A(t)=15 ?

  about 5.6 days

step-by-step explanation:

we can fill the given information into the decay equation and solve for the value of t at which half the sample remains.

the half-life is about 5.6 days.

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a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24