Answer:
-840
Step-by-step explanation:
When we multiply two intergers with the same sign, the product will be positive. When we multiply intergers with different signs, the quotient will be negative
[tex]( - 5) \times ( - 3) = 15[/tex]
[tex]15 \times ( - 8) = - 120[/tex]
[tex] - 120 \times 7 = - 840[/tex]
