r+5r+5=-25
5r = 25 is a linear equation in one variable, r. The solution is r = 5.
2.8
I = v/r
25 pi sqm
37 divided by 8 equals 4 with a remainder of 5.
0.1678
25
if: r = 5z 15z = 3y then: z = y/5 r = 5(y/5) r = y
I
d=r/t (D equals r divided on t
nPr is n!/(n-r)!. The ! is factorial; for example 5! = 5*4*3*2*1.