Strontium is a radioactive material that decays with a continuous rate (k) of -0.0244. If there are 30 grams of strontium present today and it decays continuously, how much will be present in 20 years?

18.42 g

Step-by-step explanation:

Using the exponential growth / Decay function :

A = Pe^kt

A = final amount ; P = initial amount, t = number of years ; t = 20

A = 30e^-(0.0244 * 20)

A = 30e^-0.488

A = 30 * 0.6138528

A = 18.415586

Strontium present after 20 years will be :

18.42 g

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the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950