Social epidemiology is the study of the biological basis of disease. the availability of doctors around the world. the age at which people die. the distribution of health and illness in a population.

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong

113.1

step-by-step explanation:

v=4

3πr3=4

3·π·33≈113.09734

if y=4x then you will substitute 4x in for y in the second equation.

8x + 4x = 18 combine like terms

12x = 18 divide by 12 on both sides

x = 18/12 or 3/2

now replace x in the first equation with 3/2 to get

y = 4 3/2

y = 6

the answer is a

(3/2,6)

hope that .

brainliest is always apprectiated