Jeff starts driving at 45 miles per hour from the same point that lauren starts driving at 40 miles per hour. they drive in opposite directions, and lauren has a half-hour head start. how long will they be able to talk on their cell phones that have a 270-mile range?

45x +40(x+0.5) =270

45x +40x +20 =270

85x = 250

x = 250/85 = 2.94 

45 * 2.94 = 132.3 miles

40*(2.94 +0.5) = 40*3.44 = 137.6

2.94 hours

answer: i guess 5 units?

step-by-step explanation:

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk