I need help solving this problem please!

But I also need the age of the rock please!

Devise the exponential growth function that fits the given data, then answer the accompanying question. Be sure to identify the reference point (1 = 0) and units of time. Uranium-238 (U-238) has a half-life of 4.5 billion years. Geologists find a rock containing a mixture of U-238 and lead, and determine that 67% of the original U-238 remains; the other 33% has decayed into lead. How old is the rock? What is the reference point (t = 0)? O A. The state of the rock 4.5 billions years ago. O B. When the rock does not contain any more of the original amount of U-238 O C. The current state of the rock with 67% of the original amount of U-238. O D. When the rock contained 100% of the original amount of U-238. What are the units of time? O decades O years billions of years months Write the exponential growth function. Use yo the initial value of y y(1) = Click to select your answer(s). Submit Test ~ 0 9 (4 4) 7:53 AM