The price of bread went from $1.50 per loaf to $2.50 per loaf in four years. find the rate of change of the price of bread.

The increase in price in 4 years can be written as ($2.50-$1.50)/4 = 0.25 cents every year, which makes sense because 4 x 0.25 = $1, which is the change in price over those 4 years.  Got it?

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.

That’d be 9 years or something