Suppose A and B are sets such that AuB has 20 elements, AnB has 7 elements, and the number of elements in B is twice that of A. what is the number of elements in A?

the least common denominatore of 7 and 2 is 9

step-by-step explanation:

7+2=9

7.3

step-by-step explanation:

y/x of point b= y/x of point a

step-by-step explanation:

(i got the same question, this was the correct answer.)

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)