Respuesta :

C = 19.99 + 0.15x

1️⃣ C = 0.15(78) + 19.99

2️⃣ C = 11.7 + 19.99

3️⃣ C = 31.69


4️⃣ The total cost is $31.69

5️⃣ The cost to send 78 text messages is $11.70

♡´・ᴗ・`♡Brainliest Please♡´・ᴗ・`♡