
Proteins are made of a long chain of amino acids, which has been coded for by DNA. The order of the bases of DNA determines which protein is made, by coding for a specific order of amino acids. This…


This is a beginner lesson for prealgebra or 7th grade math — onestep equations that are solved by multiplying or dividing.
First, I explain how we simplify expressions such as 5x/5 (the
…


In this basic lesson I show several examples of using the
distributive property of multiplication over addition, including an area
model (rectangles). Lastly we even touch on using the distributive…


In this second part we will solve more challenging examples that have
more operations than the ones in part 1. The expressions include
exponents plus other operations. In these examples, divisions…


This is the first part of the lesson on the order of operations. I start out with a minireview of
exponents and then we study the order of operations (PEMDAS rule),
followed by a few solved…


This is a prealgebra math lesson where I show how to write an equation to
match a written sentence (2 example problems). Then we look at
mathematical expressions that match a reallife situation…


This video lesson explains the difference between an
expression and equation, gives examples of both, and shows how to write
expressions from verbal descriptions. In a nutshell, an expression…












Biased questions HW pg. 552 #715






