He would need to sell 28 because
12.50*28=350 and 350+50=400
6 2/3 + 1 5/6 = 8 1/2
i am a mathematics teacher. if anything to ask please pm me
It is C, however I might be wrong so you can visit this website.
Websites: https://www.varsitytutors.com/hotmath/hotmath_help/topics/converse-inverse-contrapositive
Answer:
Step-by-step explanation:
f'(x)=-sin x

c=0∈(-π/3,π/3)