Math
posted by Nnnnn .
Combine like terms to simplify the expression.
1/_4+6+9y=
Answer: 5y+6
2/ 20a+7+3=
Answer: 20+10
3/_5k+9_2+9k=
Answer: 4k+7
4/ 17+2.9h+3=
Answer: 30+14
Simplify the expression.
5/ _4(3+d)+7d_d=
Answer: _16+6d
6/ 8+5(j_5)+3j_1=
Answer: 32+8j_1
7/ 9(b_3)+4(b_5)=
Answer: 5b+22
8/ _2(2g_6)+4(g_3)=
Answer:zero+9

3 is right. The others are wrong.
Please note that a minus sign is  not _ 
Try using the minus () sign for subtraction, not the underscore (_)!
Anyway, you got them almost all wrong:
4+6+9y = 2+9y (since 64=2)
20a+7+3 = 20a+10
5k+92+9k = 4k+7 OK
17+2.9h+3 = 20+2.9h
4(3+d)+7dd = 124d+7dd = 12+2d
8+5(j5)+3j1 = 8+5j25+3j1 = 8j18
9(b3)+4(b5) = 9b27+4b20 = 13b47
2(2g6)+4(g3) = 4g+12+4g12 = 0
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