4x Consider the geometric sequence: 3,15,75,375,1875ldots 1. What is the constant ratio, r, for this sequence? 2. User to write the explicit formula for the sequence. 3. What type of function does the formula represent?What is its base?

1. The constant ratio, r, for this sequence is 5. This is because each term in the sequence is 5 times the previous term.<br /><br />2. The explicit formula for the sequence is $a_n = 3 \cdot 5^{(n-1)}$, where $a_n$ represents the nth term in the sequence.<br /><br />3. The formula represents an exponential function. Its base is 5.