David and Luisa are trying to determine if two samples are the same or different substances. First, they observed sample 1 and sample 2. Then, they wrote down their observations. Review their observations. Then, answer the questions below.

Which student’s observations would prove more useful to a chemist?

David's observations

Luisa's observations
Explain your answer below.

Luisa's Observation.

Explanation:

Luisa's observation is explained better than David's was, and judging by the observations, David studied the same material, while Luisa's observation contained different description, meaning that there was likely more than one substance being observed and studied.

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles