Apolling organization contacts 2077 adult women who are 30 to 70 years of age and live in the united states and asks whether or not they had received a mammogram during the past year. what is the population in the study?

a. adult women who are 30 to 70 years of age and have received a mammogram.
b. adult women who are 30 to 70 years of age.
c. adult women who are 30 to 70 years of age and live in the united states.
d. adult women who are 30 to 70 years of age and live in the united states and have received a mammogram.

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!