What is 65(-20) equals and the other one

65(-20) equals -1300. This is found by multiplying normally but then making it negative yet again due to the negative symbol.

64/-2 equals -32. This is found by dividing 64 by two but then making the result negative due to the negative symbol.

Hope this helps!

Letter a is equal too -1300
and letter b =-32
hope this helps