Please help answer all parts of question 5 (a-d). I attempted to solve the question but as you can see, I wasn't successful at it. Please show work.
Determine the value of I when a = 10, b = 20, c = 30, and d = 40. Use the formula I = (a + b) * (c - d).
I tried to solve it using the given values: I = (10 + 20) * (30 - 40) = 30 * (-10) = -300. However, I'm not sure if this is correct. Can you please confirm?