You have $ 20 $20dollar sign, 20 to spend on taxi fare. The ride costs $ 5 $5dollar sign, 5 plus $ 2.50 $2.50dollar sign, 2, point, 50 per kilometer. Write an inequality to determine the distance in kilometers, d dd, you can ride for $ 20 $20dollar sign, 20.

  5 +2.50d ≤ 20

Step-by-step explanation:

The total cost of the ride (excluding any tip) will be the sum of the initial cost ($5) and the distance cost. The latter is the distance in kilometers (d) multiplied by the cost per kilometer ($2.50). So, the cost of the ride is ...

  5 + 2.50d

We want this to be no greater than $20. Your inequality is ...

  5 +2.50d ≤ 20

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!