Answer:
B 3
Step-by-step explanation:
Given
[tex]Expression\ A: (-5)(-0.4)(1.8)[/tex]
[tex]Expression\ B: (-45)(-19)(-112)[/tex]
[tex]Expression\ C: -1(5+17)[/tex]
[tex]Expression\ D: (-5)(-0.4)(1.8)(-3.25)[/tex]
[tex]Expression\ E: (-49)(-34)(-12)(-12)[/tex]
[tex]Expression\ F: -1(3.5-7)[/tex]
Required
How many of them will have a positive result
Taking the expressions one after the other:
[tex]Expression\ A: (-5)(-0.4)(1.8)[/tex]
Convert brackets to multiplication
[tex]Expression\ A: -5*-0.4*1.8[/tex]
[tex]Expression\ A: 3.6[/tex]
This has a positive product
[tex]Expression\ B: (-45)(-19)(-112)[/tex]
Convert brackets to multiplication
[tex]Expression\ B: -45*-19*-112[/tex]
[tex]Expression\ B: -95760[/tex]
This has a negative product
[tex]Expression\ C: -1(5+17)[/tex]
Solve the expression in bracket
[tex]Expression\ C: -1 *22[/tex]
[tex]Expression\ C: -22[/tex]
This has a negative product
[tex]Expression\ D: (-5)(-0.4)(1.8)(-3.25)[/tex]
Convert brackets to multiplication
[tex]Expression\ D: -5*-0.4*1.8*-3.25[/tex]
[tex]Expression\ D: -11.7[/tex]
This has a negative product
[tex]Expression\ E: (-49)(-34)(-12)(-12)[/tex]
Convert brackets to multiplication
[tex]Expression\ E: -49*-34*-12*-12[/tex]
[tex]Expression\ E: 239904[/tex]
This has a positive product
[tex]Expression\ F: -1(3.5-7)[/tex]
Solve the expression in bracket
[tex]Expression\ F: -1*-3.5[/tex]
[tex]Expression\ F: 3.5[/tex]
This has a positive product
Expressions A, E and F have positive products. This implies that, there are 3 expressions with a positive product.
