Step-by-step explanation:
(a - b)²
= a² - 2ab + b²
= (a² + b²) - 2(ab)
= (33) - 2(7)
= 19.
The equation is in the format
where a is the initial value (when t=0), b is the rate of change between terms, and t is the amount of time.
Our initial value is 100. We find the rate of change by first finding the percent of change:
amount of change/original amount
= 20/100 = 0.2
This is a percent decrease, so we will subtract it from 1:
1-0.2 = 0.8
This goes in for b.
Given:
Basic cost = $45
Cost of long distance calls = $0.10 per minute
To find:
The total cost if you had 45 long distance minutes.
Solution:
Let the total cost be y for x minutes long distance calls.
Cost of long distance calls for one minute = $0.10
Cost of long distance calls for x minute = $0.10x
Total cost = Basic cost + Cost of long distance calls for x minute
Substitute x=45, to find the total cost if you had 45 long distance minutes.
Therefore, the total cost if you had 45 long distance minutes is $49.5.
Ans is 4 because 4x4+8=24
Answer: b
Step-by-step explanation: 123212p1233213,12,3l12n321
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