Which of these includes an infinitive phrase functioning as an adverb?
apply sunscreen thoroughly to avoid skin damage.
the purpose of sunscreen is to block harmful rays.
to be safe, apply sunscreen an hour before exposure
do you really want to risk your health for a tan?

The answer to your question would be C.

Step-by-step explanation:

The reason being an infinitive is a verbal that can function as noun, adjective, or adverb. It is formed by using "to" + the verb.

in simplified version   it would be x ≤-4

step-by-step explanation:

multiply each term in x ≤-4 by -1

hello :

by applying the distributive property :

6 × 4.3 = 6 × ( 4 + 0.3 )

            =   (6 ×   4) + (6 ×   0.3)

            = 24 + 1.8

6 × 4.3 = 25.8