Function ? represents either addition or subtraction, what is the value of 3?4?
1) (3 ? 0) ? 4) = (3 ? (4 ? 0)
2) 这个肯定可以
X+Y=Z?
1) X+Z = Y
2) Y+Z = X
Gross profit was 15% of cost and cost is $200, increased profit by $20, what percent is the profit to cost now?
19%
21%
23%(my choice)
25%
27%
Isosceles triangle ABC, angle ABC = 70’ which angle below can be angle ACB
1) 40’
2) 55’
3) 70’
我选1，2，& 3
(4)6(3)5 + (16)3(3)5 = ?
Ans: (2)13(3)5 | 
