Which of the following is the additive identity of 5 + 2?
A. 0
B. 1
C. -(5+2i)
D. 5 - 21

Write two subtraction equations that are equivalent to 5 + 12 = 17.

Which of the following is true for the relation f(x)=2x^2+1

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document