It would take 500 minutes for the cost to be $21.50.
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Linear equation</h3>
A linear equation is in the form:
y = mx + b
where y, x are variables, m is the rate of change (slope) and b is the y intercept.
Let y represent the cell phone bill for x minutes. Using points (230, 17.45) and (370, 19.55):
For 150 minutes:
y = 0.015(150) + 14 = 16.25
For $21.50:
21.50 = 0.015x + 14
x = 500
It would take 500 minutes for the cost to be $21.50.
Find out more on Linear equation at: brainly.com/question/13763238
Answer:
Multiple it by its reciprocal (the opposite/backwards version)
Step-by-step explanation:
BTW I like your name
The answer is C because 1 changes nothing
Suppose the three sides are a, b, and c, with c being the longest, a being the shortest
first equation: c=(a+b)-66
second equation: 2a=c-55=> c=2a+55
plug c=2a+55 into the first equation: 2a+55= a+b-66 => b=a+121
a+b+c=a+(a+121)+(2a+55)=7272 =>4a+176=7272 =>a=1774
a=1774, b=1895, c=3603
640,000 powers of 10 4×=10×10×10×10=10,000 10,000×64=640,000