Question

How do you solve this problem?

Answer 1

9514 1404 393

Answer:

-19.2

Explanation:

Fill in the given values and do the arithmetic.

`\displaystyle x\ \blacksquare\ y=(x)/(y)-xy\\\\4\ \blacksquare\ 5=(4)/(5)-4\cdot5=0.8-20\\\\\boxed{4\ \blacksquare\ 5=-19.2}`