In 1965, about 44% of the u. s. adult population had never smoked cigarettes. a national health survey of 1472 u. s. adults (presumably selected randomly) during 2010 revealed that 677 had never smoked cigarettes. a 99% confidence interval for the proportion of u. s. adults in 2006 who have never smoked is

she will travel a distance in the range of 3 - 11 miles

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15