0.41% of what is 21.84 plz hurry

Which formula gives the area of a triangle? a=1/2(b+h)

An an average person has 6×10 by the power of two as many red blood cells as white blood cells a small sample of the blood has 7×10 by the power of three white blood cells about how many red blood cells are in the sample

Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?