A certain type of bacteria doubles every 4 hours. If you started with 37 bacteria, how many would you have after 12 hours

Plz which expression is equivalent to the expression below?

Choose the more precise measurement. 26.4 cm or 8.39 cm

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.