What is the additive inverse 16 5/7

If there are 3.281 feet in 1 meter, how many inches are in one centimeter

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

What is the value of the discriminant, b2 ? 4ac, for the quadratic equation 0 = x2 ? 4x + 5, and what does it mean about the number of real solutions the equation has?