Final answer:
The value of 1/5a when a = 0 is 0. The value of sin 30° + cos 60° is 1.
Step-by-step explanation:
To find the value of 1/5a when a = 0, we substitute the value of a into the expression. So we have: 1/5(0) = 0. Therefore, the value of 1/5a when a = 0 is 0.
To find the value of sin 30° + cos 60°, we use the trigonometric values of these angles. We know that sin 30° = 1/2 and cos 60° = 1/2. Therefore, sin 30° + cos 60° = 1/2 + 1/2 = 1.