拜托各位帮忙算一下这两道prep的数学题，多谢了

The rate of a certain chemical reaction is directly proportional to the square of the concentration of A present and inversely propotional to the concentration of chemical B present.IF the concentration fo chemical B is increased by 100 precent,which of the following is closest to the percent change in the concentration of chemical A require to keep the reaction rate unchanged?

a,100% increase   b,50% increase.c,40%increase,d,40% decrease.e,50% decrease

if ab不等于0，and points(-a,b)and(-b,a)are in the same quadrant of the xy-plane,is point(-x,y)in the same quadrant?
1.xy bigger than 0
2.ax bigger than 0