The formula b=40+3w_5 is used to work out the electricity bill,b naira,for a month in which w kilowatt hours of electricity are used
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To work out the electricity bill using the given formula, you need to substitute the value of "w" in kilowatt hours into the formula and then evaluate the expression. Here's how you can do it step-by-step:
1. Start with the formula: b = 40 + 3w/5
2. Identify the value of "w" in kilowatt hours that you want to calculate the bill for. Let's assume "w" is 100 kilowatt hours for this example.
3. Substitute the value of "w" into the formula: b = 40 + 3(100)/5
4. Simplify the expression inside the brackets: b = 40 + 300/5
5. Perform the division: b = 40 + 60
6. Perform the addition: b = 100
Therefore, if 100 kilowatt hours of electricity are used in a month, the electricity bill would be 100 naira.