Kayla buys a $20 phone card. She is charged $0.15 per minute for long distanced calls. What equation gives the value (v) left on her card after she makes (t) minutes of long distance calls.

20 - 0.15t = v

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A typical american baby weighs about 8 pounds at birth and gains about 1.5 pounds per month for the forst year of life. What equation rates weight w in pounds to age a in months?

To find the value left on Kayla's phone card after she makes a certain number of minutes of long distance calls, we need to subtract the total cost of the calls from the initial value of the card.

The total cost of the calls can be calculated by multiplying the cost per minute by the number of minutes she has used: Cost = 0.15 * t.

The value left on the card is given by the initial value minus the total cost: v = 20 - (0.15 * t).

So, the equation that gives the value left on Kayla's card after she makes t minutes of long distance calls is v = 20 - (0.15 * t).