The cost of a telephone call is $0.75 + $0.25 times the number if minutes. write an algebraic expression that models the cost of a telephone call that lasts t minutes

The cost of $0.75 is fixed, so the total cost of the phone call can't be less than 0.75.

Then, we add the variable part, the one depending on the number of minutes. If every minutes costs $0.25, then minutes cost dollars.

So, if you add the fixed and variable prices, you have the function modelling the cost of a telephone call that lasts minutes:

answer

explanation

the area of a circle is calculated using the formula

or

we can use any of the above formulae to calculate the required. preferably, let us use the latter since the diameter is

we substitute the diameter into the formula to get:

this is the exact value for the area of the circle.

the correct answer is a

the answer is 5636.7