What’s the question is there supposed to be a picture because their isn’t
Answer:
2√15
Step-by-step explanation:
Increasing on (-infinity , 3)
Let the number be x, twice the number wil be 2*x=2x, minus 4, 2x-4=16, collect like terms, 2x=16+4, 2x=20, divide both sides by 2 x=10
