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annluk1813
If 4·10= 40 then 4·-10 would equal -40 bc a positive times a negative equals a negative.

Hope this helped!!
mariahquevedo259021

Answer:

Step 1 Given.  4·0=0

Step 2 Substitute. Any number plus its opposite is zero.   4(10+-10)=0

Step 3 Use the distributive property.    4·10+4·-10=0

Step 4 Multiply. 40+4·-10=0

Step 5 Subtract 40 from both sides.    4·-10=0-40

Step 5 Simplify to solve for 4·-10.        4·-10=-40

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