Can someone please turn this into an equation? Also would the equation be substitution or elimination?

Hiroki wrote a number that is the opposite of -3. what number did hiroki write? a. ⅓ b. 3 c. 0 d. -3

Franco wants to double the volume of the cone. what should he do?

Vinay constructed this spinner based on the population of teachers at his school according to vinays model what is the probability that he will have a male history teacher two years in a row