nehadani nehadani

17-04-2015
Mathematics

contestada

Prove that mn < 0 if and only if m > 0 and n < 0 or m < 0 and n > 0

Respuesta :

18-04-2015

Only one number can but negative for it to be true.

If both positive then product is positive

If both negative then product is also positive

(-1)*(-1)=1

Answer Link

Otras preguntas

Three fifths of the cast in a musical have to sing.What fraction on the cast does not have to sing?

how do u say 12.87 time as a fractional number

The amount of moisture in a prevailing wind depends on which two factors? temperature and downslope of mountains air pressure and warm fronts barometric pressur

Which is a run-on sentence? A. His helmet bore the number of the firehouse, which was more than 100 years old. B. A worn yellow quilt was lying at the foot of t

How did the earliest sculptors use the shapes found in natural materials to their advantage? (5.1-Earliest Beginnings)

what may occur when the burning of fossil fuels releases gaseous nitrogen oxides and sulfur dioxides into the atmosphere?

What bones fuse together during childhood?

Which sentence uses a verb that agrees with its subject? A. Was the people playing soccer at the park? B. Near the coast lives several species of aquatic birds.

Which ratio correctly compares 15 m to 45 cm? A. 10 : 3 B. 100 : 3 C. 1 : 3 D. 1 : 300

in a recent survey, 336 out of 500 people chose reallygood cola as their favorite soft drink. If a similar survey was conducted out of 2,000 people, how many pe