PLEASE ANSWER ASAP :) A person swims 11 miles downstream in the same time they can swim 7 miles up stream. The speed of the current is 4 miles per hour. These situations can be represented by the equations
Downstream: t=11/s+4 Upstream:t=7/s-4,
where t stands for time and s is the speed of the swimmer. What is the speed of the swimmer swimming in still water?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

The tuition costs, c, for a local community college are modeled by c(h) = 250 + 200h, where h represents the number of credit hours taken. the local state university has tuition costs, s, modeled by the function s(h) = 300 + 180h. how many credit hours will a student have to take for the two tuition costs to be equal? round the answer to the nearest tenth of an hour.

Find measure angle 1 and measure angle 3 in the kite the diagram is not drawn on the scale