4√0.85^3

4 * (√0.85^3) = 4 * (0.85^3)^(1/2) = 4 * (0.6141) = 2.456

To calculate 4√0.85^3, we can break it down into two steps:

Step 1: Calculate 0.85^3
To calculate this, we need to cube 0.85. Using a calculator, we find that 0.85^3 is equal to 0.614125.

Step 2: Calculate the fourth root of 0.614125
To find the fourth root, we need to find a number that, when raised to the power of 4, equals 0.614125. Using a calculator, we find that the fourth root of 0.614125 is approximately 0.849.

So, 4√0.85^3 is approximately equal to 0.849.