Radioactive isotope #1
has been kept for 12.5 years. Originally, there were 20 grams and now there are 19.808 grams.
What is the half-life?
When will there be 1 gram left?
Round rate to 8 decimals.

Which statement is always true? a. square bcdf is a rectangle. b. rectangle gjkm is a square. c. quadrilateral stpr is a trapezoid. d. parallelogram abcd is a rhombus.

Which composition of similarity transformations maps polygon abcd to polygon a'b'c'd'? a dilation with a scale factor less than 1 and then a reflection a dilation with a scale factor less than 1 and then a translation a dilation with a scale factor greater than 1 and then a reflection a dilation with a scale factor greater than 1 and then a translation

In the diagram of circle o, what is the measure of zabc?