Question

Expression A Expression B Expression C (−5)(−0.4)(1.8) (-45)(-19)(-112) −1(5+17) Expression D Expression E Expression F (−5)(−0.4)(1.8)(−3.25) (-49)(-34)(-12)(-12) −1(3.5−7) How many expressions will have a product that is positive?

Answer 1

Expressions A, E, and F

Explanation:

In general, when negative integers are multiplied; if the negative integers are even, then the product would be positive. But if the negative integers are odd, then the product would be negative.

Thus,

A. (−5)(−0.4)(1.8) = (2.0)(1.8)

= 3.6

B. (-45)(-19)(-112) = (855)(-112)

= -95760

C. −1(5+17) = -1(22)

= -22

D. (−5)(−0.4)(1.8)(−3.25) = (2.0)(-5.85)

= -11.7

E. (-49)(-34)(-12)(-12) = (1666)(144)

= 239904

F. −1(3.5−7) = -1(-3.5)

= 3.5

Thus expressions A, E and F have positive products.