a number is first increasedby 40 percent and then decreased by 25 percent again increased by 15 percent and then decreased by 20 p...
z x z= 12+13
7x^2+ 8x=x^2
1.8×10^-5÷0.04
1/2 * 1/ 10
2+2
(1+a^2)x^2 + (b^2-c^2)=find c^2(1+a^2)
