MATHS雜錦**快*快*快*急用***

1) The number of hours John spends on studying is normally three times that of Simon's. In this week, each one of them spends an additional 6 hours on studying. As a result, the number of hours John spends on studying is twice that of Simon's. How many hours in this week does they spend on studying?
(呢題問答題)←equation
Let x hours in this week be Simon spends on studying,
(3X+6)/2=x+6
2(3X+6)/2=2(x+6)
3X+6=2X+12
X=6
......

2)(x+3y)(2X-Y)(2X+Y)
......
(呢題問下幾步點做)←algebraic expresion

3)2q/100y+2y/100(5q)+3y(q)
=2qy/100+10yq/100+3yq
......
(呢題問下幾步點做)←algebraic expression

4)If S(s,s+2) is on the graph of y=1/2x+5, find the value of s.
A.-3
B.-6
C.3
D.6
(想問點做同點解,5好淨係卑mc答案我,教我解)

5該要快同好
教我
thx