The text recommends simplifying an expression (combining like terms) before evaluating. do you think this is necessary? evaluate the expression 4x^2-5(x+2)+3x+10+2x for x=3: a. by substituting and then evaluating b. by fist simplifying and then evaluating. which method would you recommend? why?

Step-by-step explanation:

A recipe for four batches of bread uses 5 cups of flour.

Firstly, we want to determine the number of cups of flour needed to produce one batch of bread. This means we want to determine the unit rate of producing batches of bread. It becomes

If four batches of bread uses 5 cups of flour,

Then 1 batch of bread will use x cups of flour

4x = 5

x = 5/4 = 1.25

1 batch of bread will require 1.25 cups of flour

Secondly, we want do determine how many batches of bread that can be made using 1 cup of flour. It becomes

If four batches of bread uses 5 cups of flour, then

y batches of bread will need 1 cup of flour

5y = 4

y = 4/5 = 0.8

1 cup of flour will produce 0.8 batch of bread