A particular substance decays from 500 mg to 100 mg in 180 years. If the decay is exponential, what is the half-life of the substance

can you attach a picture of the lettuce? : )

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?