A . Because one you make the ratio 80:48 you simplify (divide until you can divide anymore ).
The answer would be -3/2
A reciprocal is the inverse of a number.
When using this in fractions just switch the numerator and denominator. This is done by dividing the fraction by one, but in the case of a negative fraction you would divide by negative 1.
The answer is 1
factors of 25 are 25, 5, 1
factors for 77 are 77, 11, 7, 1