I took the quiz and this what the answer, I hope this help future people that had the same question.
Answer:d
Step-by-step explanation:
We can write and solve the differential equation that fits the statement given;
dy/dt = k(50-t)
∫dy = ∫ k(50-t)dt
= ∫ (50k - kt) dt
therefore;
y = 50kt - k/2(t²) + C
Alternatively, can be written as
y = - k/2 (50-t)² + C)
Three hundred and ten million, seven hundred and sixty three thousand, one hundred and thirty six.