126.55รท7
there are 10 boys and 20 girls in a class
the class had a test
the mean mark for all the class is 60
the mean mark for the g...
solve the system of homogeneous equations, x+y-5z+3w=0; 3x-y+3z-5w=0;5x-3y+z-9w=0;9x+y-5z+w=0
6p+p+2
2(x+y)+20=(x+20)+(y+20)
find x and y
1/8+1/4
2x+2y+20=x+y+40
find value of x and y
Factorize fully 16a
2b3 + 20a
3b
x*x-y*y-8yz-16z^2 FACTORISE
find value of x
