Si X es una variable que sigue una distribución normal y P(−a≤X≤a)=0.869, encuentre el valor de "a", a>0 ayuda por favor

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Miss henderson wants to build a fence around a rectangular garden in her backyard in the scale drawing the perimeter of the garden is 14 in of the actual length of a b is 20 ft how many feet of fencing what you need