because the formula of finding the area of a triangle is base times height divided by 2 so thatshow you get the answer, multiply 10by15 and then divide by 2
4n+8=2(n+6) Now isolate the n on one side of the equation: 4n+8=2n+12(distribution of the 2) 4n=2n+4(combine like terms) 2n=4(combine like variables) N=2(isolate the n)