Let f (7) = 12 and g(2) = 7, then what is the value of (f ∘ g)(2)

Two parallel lines are crossed by a transversal.what is value of x

2.5 milligrams is equivalent to how many grams

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)