Astudent must have an average for five test grades that is greater than or equal to 80% and less than 90% to receive a final grade of
b. gabi's grades on the first four tests were 98, 76, 86 and 92. what range of grades on the fifth test would give her a b in the course?

The answer is 100.Well at leasl i think it is

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.