Danielle owes $29.50 for text messaging in the month of april. if her text messaging plan costs $15 for the first 350 messages and 0.25 for each additional text message, how many text messages did she send that month?

owes $29.50 in april

plan: $15 for 350 messages + $0.25 for each additional message

steps:

15 + 0.25x = 29.50  (let x = number of additional messages)

0.25x = 14.50 (subtract by 15 on both sides)

x = 58 (divide by 0.25)

58 + 350 = 408 messages

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m