Answer:
it took him 3 hours
Step-by-step explanation:
28 divideed by 4= 7
21divided by 7=3
Step by step answer by answer choice by choice
Answer:
-0.31.
Step-by-step explanation:
Cos (7π/5) is in the third quarter so the cosine is negative.
Cos 7π/5) = - cos (7π/5 - π)
= -cos 2π/5)
= -0.31.