Rewrite the equation by completing the square.

x^2 -2x+1=0

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.