Promethium has a half-life of 18 years. The equation A=200(12)1t can be used to find the amount, A, of promethium left after t years. Initially, there are 200 milligrams. Over the first 18 years, what is the average amount of promethium lost per year? Round your answer to the hundredths place.

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)

what steps are you having us

step-by-step explanation:

answer: i also need

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