The amount of blood in a person's body, a quarts, is directly proportional to his or her body weight, w pounds. a person who weighs 128 pounds has about 4 quarts of blood. a) find the constant of proportionality. b) write an equation that relates the amount of blood in a person's body to his or her body weight. c) find the weight of a person whose body has about 5 quarts of blood.

Step-by-step explanation:

Let a represent the amount of blood in a Peron's body in quarts.

Let w represent the weight of the Peron's body in pounds.

Therefore,

a is directly proportional to w

a) Let k represent the constant of proportionality. Therefore,

a = kw

A person who weighs 128 pounds has about 4 quarts of blood. This means that

4 = k × 128

k = 4/128 = 0.03125

b) The equation that relates the amount of blood in a person's body to his or her body weight would be

a = 0.03125w

c) the weight of a person whose body has about 5 quarts of blood would be

5 = 0.03125w

w = 5/0.03125 = 160 pounds

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13