add these expressions. calculate horizontally as shown, or rewrite the calculation vertically,

1. (4x+1) + (9x-1)
2.-2k(k+3)+k(3k+5)
3.(5x-2y)+5(x+2y)

im so confused some one help me pls

Question

add these expressions. calculate horizontally as shown, or rewrite the calculation vertically, 

1. (4x+1) + (9x-1)
2.-2k(k+3)+k(3k+5)
3.(5x-2y)+5(x+2y)

im so confused some one help me pls

anonymous · Answer

for 1. just combine like terms, take out the parenthesis also
and get 13x

2. use distributive property
-2k^2-6k+3k^2+5k
simplify
k^2 -k

3. use distributive property to multiply in the 5
and get
5x-2y+5x+10y
simplify
10x+8y