Henrietta buys 25 notebooks and 5 packs of pencils for her students. she also buys packs of pens. in total, henrietta buys 34 items.

Henrietta buys 25 notebooks and 5 packs of pencils for her students. She also buys packs of pens. In total, Henrietta buys 34 items.

If notebooks, packs of pencils, and packs of pens are the only items that Henrietta purchases, how many packs of pens did Henrietta buy?

4

5

20

30

Step-by-step explanation:

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation:

-9

step-by-step explanation: