Find the cost C for a 10-minute phone call if the cost x for the first 3 minutes is $1.80 and the cost y for each additional minute is $0.35. Use C = x + 7y.
The Answer I got is $5.49.
3+7×0.35
x+7y
C = $1.80 + ( 7 x $0.35 )
= $4.25
Sumare's answer is not correct
Several of Sumare's answers were incorrect last night/early this morning.
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To find the cost C for a 10-minute phone call using the given information, we will use the formula C = x + 7y.
First, let's determine the value of x, which is the cost for the first 3 minutes. It is given that x = $1.80.
Next, we need to determine the value of y, which is the cost for each additional minute. The cost for the first 3 minutes is already accounted for in x, so we need to calculate the cost for the remaining 7 minutes.
The cost for each additional minute is $0.35, so the cost for the remaining 7 minutes can be calculated as 7 * $0.35 = $2.45.
Now, we have the values of x and y, so we can substitute them into the formula C = x + 7y to find the total cost C.
C = $1.80 + 7 * $0.35
C = $1.80 + $2.45
C = $4.25
Therefore, the cost C for a 10-minute phone call is $4.25.