20. AARP and Medicare (3.5) To find out what pro- portion of Americans support proposed Medicare
legislation to help pay medical costs, the AARP
conducted a survey of their members (people
over age 50 who pay membership dues). One of
the questions was: “Even if this plan won't affect
you personally either way, do you think it should
be passed so that people with low incomes or peo-
ple with high drug costs can be helped?” Of the
respondents, 75% answered yes.1
(a) Describe how undercoverage might lead to bias in
this study. Explain the likely direction of the bias.

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0

the ratio of grapes to blueberries she should use is 12: 3

step-by-step explanation:

if mandie is making 15 cups of fruit salad, the ratio of grapes to blueberries she should use is 12: 3.

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.