bi A radio active isotope of plutonium, Pu2'3E. is used to nta ire 'therrnoelectric power sources for space-craft. The halflife of Pu-23E is 31".? years. A space probe was launched in 2012 1with ll] kg of Pu-EBE. Write a function of the form it] = Hoe '\"to model the quantity Chit} of Pu233 that is left t years after 2312. If 1.5 kg of PuEEB is required to power the spacecraft's data transmitter, for how long after launch would scientists be able to retrieve data? [Show your equation and work. Round answer to the nearest year.)