Answer:
Sam
30
Step-by-step explanation:
Sam made a mistake when he said
. The steps should have been:

You are supposed to square 5 first before multiplying 2. Sam multiplied by 2 first. The correct answer is 30.
Answer:
d=0.25
Step-by-step explanation:
4 + 4*d = 5
4d = 1
d =0.25