Suppose that 15% of the time Tucker goes swimming twice a week 25 % of the time he goes swimming once a week, and 60% of the time he doesn't go swimming at all in a given week. What is the expected value for the number of times Tucker goes swimming during a week?

In the surface area formula for cylinders which expressionrepresents the lateral area

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1