What do you notice about rectangles and parallelograms? What is the same or different between
these two polygons?

both have four sides and equal measures with the opposite side. Parallelograms are slanted while the rectangles are straight.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

1/4 because there is 4 grades.