I WILL GIVE BRAINLIEST IF CORRECT The diameter of a red blood cell is about 0.0008 cm. The diameter of a

whooping cough virus is about 2.5 x 10-5 cm. What is the approximate ratio

of the diameter of the red blood cell to the diameter of the whooping cough

virus?

A. 3.2 x 102

B. 3.1 x 10-3

C. 3.2 x 101

O D. 3.1 x 10-2

C.

Step-by-step explanation:

= Diameter of a red blood cell =

= Diameter of a whooping cough virus =

Ratio of the diameter of the red blood cell to the diameter of the whooping cough virus

The required ratio is .

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2