the half life of a substance is defined as the period of time it takes for the amount of the substance to decay by half. the sequence below shows the amount of a substance that will be left after a certain number of half lives have elapsed.

pakistan's principal natural resources are arable land and water. about 25% of pakistan's agriculture accounts for about 21% [1] of gdp and employs about 43% of the labour force. in pakistan, the most agricultural province is punjab where wheat and cotton are the most grown.

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

answer: 72: 111

step-by-step explanation: