X-2=8x+12 need answer in step by step

The sum of two numbers is 12 and their difference is 18 what are the two numbers

2/3(-6y+9x) expand each expression using the distributive property

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6