2+1=23
3+1=34
4+2=26
6+3=29
7+1=?

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)

How to simply and write the answer n a whole number