What is the domain of the function represented by this graph

A. x ≥ 4
B. -2 ≤ x ≤ 2
C. x ≤ 0
D. all real numbers

The functions q and r are defined as follows. q(x)= -2x+2 r(x)= x^2 - 1 find the value of r(q(

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

Could someone me with this question i’ve been stuck on it for 20 minutes