Cell phone plan a costs $70 per month and comes with a free $500 phone. cell phone plan b costs $50 per month but does not come with a phone. if you buy the $500 phone and choose plan b, how many months is it until your cost is the same as plan a’s?

25 months

Step-by-step explanation: Let's make the equations first,

Plan A: 70x   Plan B: 50x+500

Now we make it into an equivalent equation:

70x=50x+500

Then we solve:

70x=50x+500

-50x -50x

20x=500

÷20 ÷20

x=25

To check if it's correct, we just plug it in:

70(25)=50(25)+500

1750=1750

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.

answer: 0

step-by-step explanation: the positive, like 5, + its opposite, like -5 would be 0

5+(-5)=0, or 5-5=0