Simplify the following expressions.
Please give me the solutions and the answers,thanks!
1.(x+2)+(8x-3)+(30-2x)
2.(1-y)-(2y+3)+(3y-5)
3.(x+y)+(y-z)-(x-z)
4.(3a+b)-(2b-c)+(3c-2a)
5.(s二次方-t+2)-(3s二次方-3t+st)
6.(4r二次方+5s二次方)+(7r二次方-3s二次方+6rs)
7.(2m二次方-3n二次方-mn)-(5m二次方-n二次方)
Simplify the following expressions and arrange the terms in ascening powers of the variables.
8.(8x三次方+4x-5x二次方)-(5x二次方+x+9x三次方)
9.(y二次方-1)+(-y+y二次方)-(2-y+y二次方)10(a)Simplify (1-a-2a二次方)+(a三次方+2a二次方-a),and arrange the terms in descending powers of a.
10(b)Hence,find the value of the above expression when a = -2.11.Mary has $(x+6y) and Tim has $(8y-x).If x=3 and y =4,find the total amount they have.That's all , thanks a lot !!!!!