An isotope of the element seaborgium has a half-life of 30 seconds. How much would there be left after one minute if we started with 4 pounds?

Evaluate the following expression 1/3^2

Is the point (0, 8) on the x-axis or y-axis? how do you know?

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)