Select the lines that represent functions

B,D,E

Step-by-step explanation:

The vertical line  test states that a graph represents a function if and only if any vertical line through out its domain  intersect the graph at most once.

Keeping in mind the above, we find that graph A vertical line cuts at all points. Hence not a function

B,D are E are functions since any vertical line cuts only once

C cannot be a function since at x=4 the vertical line cuts at 3 places of the graph.

So answer is

functions are

B, D and E

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.