How many solutions does this system of equations have?

a. exactly two

b. infinitely many

c. none

d. exactly one

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8