In 28% of a sum is $100.80, what is the sum?

Given the function f(x) = 3x + 1, evaluate f(a + 1). a. 3a + 1 b. a + 2 c. 3a + 4

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

I’m really confused and need your assist me with this question i’ve never been taught