Why is 4(x + 5) equivalent to 4x + 20

Let the closed interval [a , b] be the domain of function f. the domain of f(x - 3) is given by (a) the open interval (a , b) (b) the closed interval [a , b] (c) the closed interval [a - 3 , b - 3] (d) the closed interval [a + 3 , b + 3]

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

Petes dog weighed 30 pounds it then lost 16% of it's weight how much did pete lose