Please solve in a simple way : 1/(1+x) +2/(1+x^2) +4/(1+x^4)+8/(1+x^8) -16/(1-x^16)

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.

If you eat 4 medium strawberries, you get 48% of your daily recommenced amount of vitamin c. what fraction of your daily amount of vitamin c do you still need?

Can someone plz me with 11,12,13 plz show work