Elena bicycles 7 ​km/h faster than Dennis. In the same time it takes Dennis to bicycle 57km, Elena can bicycle 78km. How fast does each bicyclist​ travel? Can you also show the formula for how you got the answer? If not, that's okay, but I am trying to learn.

In the triangle rst, rs = 65 and st = 60. which equation could be used to find the value of angle s?

Suppose that prices of a gallon of milk at various stores in one town have a mean of $3.71 with a standard deviation of $0.10. using chebyshev's theorem, what is the minimum percentage of stores that sell a gallon of milk for between $3.41 and $4.01? round your answer to one decimal place.

Let y = and z = . translate "z less than y" into an algebraic expression, and solve it.