Describe the interval(s) on which the function is continuous. (Enter your answer using interval notation.) f(x) = x√x+1

Ateam of runners is needed to run a 1 2 -mile relay race. if each runner must run 1 4 mile, how many runners will be needed?

Iknow the answer but the calculator doesn't seem to give the right one

Arectangle has a perimeter of 20 cm. the length, x cm, of one side of this rectangle is uniformly distributed between 1 cm and 7 cm. find the probability that the length of the longer side of the rectangle is more than 6 cm long.