Barbara knows that she will need to buy a new car in 3 years. The car will cost $15,000 by then, How much should she invest
now at 7%, compounded quarterly, so that she will have enough to buy a new car?
a. $12,180.87
C. $13,529.14
b. $13,101.58
d. $11,443,43

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.

Here is my answer, i'm sorry if you didn't understand my explanation