Which of the following is an identity? secbcotb = cosb secbcotb = cscb secbcotb = sinb secbcotb = cscbtanb

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation:

d. all of the above

step-by-step explanation:

if im not mistaking its

step-by-step explanation:  

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21

-7 + ? = 21

-7 + 28 = 21

hope it