One hundred grams of radium are stored in a container. The amount R (in grams) of radium present after T years can be modeled by R=100e^−0.00043t. After how many years will only 5 grams of radium be present? Round your answer to the nearest whole year.

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.