So sánh a và b 4/3 < 1/11+1/12+1/13+...+1/70 < 5/2

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Your company withheld $4,463 from your paycheck for taxes. you received a $713 tax refund. select the best answer round to the nearest 100 to estimate how much you paid in taxes.

Ahyperbola centered at the origin has a vertex at (-6,0) and a focus at (10,0)