The telephone company offers two billing plans for local calls. Plan 1 charges $27 per month for unlimited calls and Plan 2 charges $11 per month plus $0.05 per call. A. Use an inequality to find the number of monthly calls for which Plan 1 is more economical than Plan 2.

Step-by-step explanation:

Step one:

Plan 1

charges = $27 monthly

the total charges is expressed as

y=271

Plan 2

charges= $11 monthly

extral= $0.05 per call

let x be the number of calls

the total is expressed linearly as

y=0.05x+112

Step two:

equating 12 and 2 we have

27=0.05x+11

collect like terms

27-11=0.05x

16=0.05x

divide both sides by 0.05

x=16/0.05

x=320

the inequality for which plan A is more economical is

0.05x+11<27 for x<=320

noncoplanar points are points that do not lie on the same line.

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this