Trig/Pre-Calc Unit 9 Calculator

y = a(1 ± r)^t

Exponential growth/decay

r = percent as decimal (move two to the left)

t = time

A = P(1 + (r/n))^nt

Compound interest

n = number of times it compounds (typically per year)

P = principal amount put into the account

A = Pe^rt

Continuous compounding/ genetic exponential

P = principal amount

A = A0 x e^kt

Continuous compounding/genetic exponential

A0 = New amount

k = constant (to be solved for)

T(t) = Ts + (T0 - Ts)e^-kt

Newtons law of heating/cooling

T(t) = Temp at time t

Ts = Temp of surroundings

T0 = Initial temp

t = time

k = constant