Answer:
something called a calculator but if u want explanation here it is
Step-by-step explanation:
2 1/2 can also be represented as 5/2 and when we open the parenthesees we get 5/2 (divided by) -10. we recipricol the -10 into -1/10 and then u multiply 5/2 and -1/10 which equeals -1/4
