1. −3⋅(−7)⋅(−15)⋅(−5)
1575
Step 1 :Multiply the given numbers: −3⋅(−7)⋅(−15)⋅(−5)
Step 2 :Since there are four negative numbers, the result will be positive: 3⋅7⋅15⋅5
Step 3 :Calculate the result: 3⋅7⋅15⋅5=1575
Step 4 :1575