- Are heads of phospholipids are polar or nonpolar?

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Hello! I need help with a problem at math: lim x->infty (-1+e^x)/e^x? I =n*A*e*vd.current is a scalar qty.from eqn. ,n,A&e are conts.hence,I is proportional to vd. Shouldn't I b a vector qty as Vd is vctor qty? What is the value of x in this heptagon? Find the equation of the tangent at a:x^(4)+y^(3)+2x-2y-2=0 at the point (-1;3)
really tough problem? What is the formula for the area of a cylinder?