(1/2 − 5/4) * 10

First, we need to find the common denominator for 1/2 and 5/4, which is 4.

1/2 = 2/4
5/4 = 5/4

Now, we can subtract:
(2/4 - 5/4) = -3/4

Finally, multiply by 10:
-3/4 * 10 = -30/4 = -7.5

Therefore, the solution is -7.5.