After moving all the terms to the right of the equation and solving you would get A = -36/49. Hope this helps!
The actual answer is 5.66666666
The reason is that because he made 238 over 42 months you divide 238$ by 42 months
To find LCM
factor and eliminate ones already represented
1=1
2=2
3=3
4=2*2
5=5
1*2*2*3*5=60
It’s b and c and i believe a
703.4 cmsquare
Hope it helps