A credit card company requires that its customers choose a 3 digit, numerical code to access their online account. Each digit sh
1 answer:
Given :
A credit card company requires that its customers choose a 3 digit.
Each digit should be chosen from 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9.
So there are 10 possibilities for each digit.
To Find :
How many different three digit codes are there.
Solution :
We know, possibility of choosing each digit is 10.
So, total number of three digit codes are :
Therefore, their are 1000 different three digit codes.
Hence, this is the required solution.
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Question:
A solar lease customer built up an excess of 6,500 kilowatts hour (kwh) during the summer using his solar panels. when he turned his electric heat on, the excess be used up at 50 kilowatts hours per day .
(a) If E represents the excess left and d represent the number of days. Write an equation for E in terms of d
(b) How much of excess will be left after one month (1 month = 30 days)
Answer:
a.
b.
Step-by-step explanation:
Given
Excess = 6500kwh
Rate = 50kwh/day
Solving (a): E in terms of d
The Excess left (E) in d days is calculated using:
The expression uses minus because there's a reduction in the excess kwh on a daily basis.
Substitute values for Excess, Rate and days
Solving (b); The value of E when d = 30.
Substitute 30 for d in
<em>Hence, there are 5000kwh left after 30 days</em>