20x^2+11x-3=0
7x=40
8x=?
1/10 -3/5
3/5 =1/10
20x^2+7x-3=0
2^x+x-1.6=0
2^x+x-1.6=
how to calculate area of a trapezium
7x = 40cm
11x = ?
5/6 -1/3
