During his vacation, Dalyn rents a small boat from a rental service that charges a flat fee of $30 plus $10 per hour (including taxes). The total charge comes to $90. Which equation can be used to calculate the number of hours, x, that Dalyn rents the boat?

In order to find out the number of hours that Dalyn used the boat, you can use the formula, 30 + 10x = 90.

Dalyn rented the boat for $30 and then an additional $10 for every hour which brought his total cost to $90.

Assuming that the hours he used the boat was x, the expression would be:

Total cost = Flat fee + (Amount per hour x Number of hours used)

90 = 30 + (10 × x)

30 + 10x = 90

If you solve this equation, the number of hours would be:

30 + 10x = 90

10x = 90 - 30

x = 60/10

x = 6 hours

In conclusion, you can use the formula, 30 + 10x = 90, to find the number of hours rented.

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He rents the boat for 6 hours

Step-by-step explanation:

10x + 30 = 90

10x = 60

x = 6