If 40% of a radioactive substance remains after 20 years, what is the half-life of the substance?

Which rational number could be graphed between -4 and -5

The liabilities of cullumber are $99,000. owner’s capital is $143,000; drawings are $96,000; revenues, $467,000; and expenses, $301,000. what is the amount of cullumber company’s total assists?

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons