Kathleen is testing a mixture containing a certain substance. She takes a sample from the top and the bottom. The sample from the bottom has more of the substance than the sample from the top. What is this mixture? a solution
heterogeneous
homogenous

The answers to this question are as following: -increase the sample size from 6 cups to 12 cups of sand and water.-use more precise digital thermometers-use more precise scales that measure to the hundredth of a gram

Flourine clead dlithium bkrypton a

The rules are different for multiplication and addition, but the least precise value always restricts the answer. first do the multiplication (as per standard order of operations): 24.6681 × 2.38 ≈ 58.7 since 2.38 has the fewest significant figures, it is considered the lease precise value then do the addition: 58.7 + 332.58 ≈ 391.3 since 58.7 has fewest figures right of decimal it is considered least precise. so final answer: 391.3 with four significant figures.