Sasha asked her classmates, "How many days do you exercise in a typical week? The dot plot shows Sasha's data.
Time Spent Exercising
4
Number of days
How many observations did she record?
A. 20
B. 18
C. 7
D. 5

I believe it would be d. I am sorry if I am wrong.

Is there a picture that you can upload?

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the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.