Step-by-step explanation:
The answer is $84.29
Let the number of minutes be x.
$35.99 is fixed price and does not depend on the number of minutes x. Each minute costs $0.21 so it depends on x and we have 0.21x in the function. However, 250 minutes are already included and should not be included in x. Therefore, the function that represents the monthly cost looks like this:
f(x) = 35.99 + 0.21 * (x - 250)
Now, let's calculate for x = 480 minutes:
f(480) = 35.99 + 0.21 * (480 - 250)
f(480) = 35.99 + 0.21 * 230
f(480) = 35.99 + 48.30
f(480) = 84.29
Answer:
23
Step-by-step explanation:
5(4) + 3
20 +3
23
Answer:
Step-by-step explanation:
Let the amount donated to City Youth Fund = $x
And the amount donated to the Educational Growth Foundation = $y
Amount donated to the Educational Growth Foundation is at least four times the amount donated to City Youth Fund.
y ≥ 4x ------(1)
Total amount she can donate is up to $440
x + y ≤ 440 ------(2)
And the constraints are x ≥ 0 --------(3)
y ≥ 0 ------(4)
And solution set will be the common shaded area of both inequalities as shown in the graph attached.
(By using a graphing tool we can find the graph).