(1) The cost of a square slab that is 2 meter long ans 0.2 meter thick is $160 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.
(2) The cost of a square slab that is 3 meter long and 0.1 meter thick is $200 more than the cost of a square slab that is 2 meters long and 0.1 meter thick.
2. In the x-y plane, does the line with the equation y=3x+2 contain the point (r,s) ?
(1) (3r+2-s)(4r+9-s)= 0
(2) (4r-6-s)(3r+2-s)= 0
3. If k is a positive integer, then 20k is divisible how many different positive integers ?
(1) k is prime
(2) k=7
4.
![Image](https://s4.postimage.org/EdSlS.png)
On the number line shown,is zero half way between r and s
(1) s is to the right of the zero
(2) The distance between t and r is the same as the distance between t and -s