The expression that represents the total amount of flour (in cups) you need is Am+Bn. The correct option is D.
<h3>What is an Expression?</h3>
In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations formed according to rules dependent on the context.
Given that one batch of blueberry muffins requires m cups of flour and You make A batch of blueberry muffins. Therefore, the total flour required for making A batch of blueberry muffins is,
Number of flour = A × m = Am
Also, Given that one batch of banana bread requires n cups of flour and You make B batch of banana bread. Therefore, the total flour required for making B batch of banana bread is,
Number of flour = B × n = Bn
Now, the expression that represents the total amount of flour (in cups) you need in total is,
The total amount of flour = Am + Bn
Hence, the expression that represents the total amount of flour (in cups) you need is Am+Bn.
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for an example. If the number is increased by 60% and the denominator is decreased by 20% we get the new fraction being: 
. Since then new one is equal to 1, and the original is equal to 
, we see that this manipulation of the fraction causes an increase of 100%.