2.000 electric bulbs arc installed in various offices of an organization. The bulbs have a mean life of 1,000 working hours with a variance of 40.000 hours. Now many bulbs may fail between 800 hours and 1.100 working hours?

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

An object is translated by (x + 4, y - 2). if one point in the image has the coordinates (5, -3), what would be the coordinates of its pre-image? (9, -5) (1, -5) (9, -1) (1, -1)

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.