N+3 2/5=11 3/20 what value of n makes the following equation true

Ineed i don’t get this at all! and you

Rewrite the following without an exponent. (5/8)-1

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?