Two jets leave tulsa at 3: 00 p. m. traveling in opposite directions. the northbound jet is flying at a rate of 850 km/h and the southbound jet is flying at a rate of 750 km/h. at what time will they be 4,000 km apart?

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g