Math is used in most parts of science. Probability is used in genetics to determine what type of genes a newborn is likely to have. Algebra and geometry are used in physics. One example would be e=mc^2. This equation shows energy. It uses variables which are e, m, and c. It also has exponents. NASA uses lots of math to determine when to launch rockets, how long the rocket should be, how long should the fins be. How wide should the fins be. Science uses a lot of math. Calculus can be used to determine the perimeter of a curved object.
Conversion is also used. 1 inch=2.54 centimeters. Did you know that the last rocket launch to mars failed because someone forgot to convert inches to centimeters, and the parachute deployed to late. Math is everywhere. I will use a parabola as an example. A parabola can be used to show a rocket and how long it takes until it will hit the ground after launch off. These are all examples of how math is used in science.
Negative Numbers can be used to show debt. Debt is when you owe someone money. If you owe someone $30. Then you are -30. If you have $30, then you are +30. Do you see the difference? I hope so. Here is another example, if someone has $30 of Starbucks credit and they buy a venti frappucino for $5. It will show -$25 on the screen. If you did not have any store credit, then it would $5. Do you see the difference? It shows -$25 dollars because the company owes you money. The $25 dollars are being shown from the company's point of view. Here is another example. If you put money in your bank account it is +. If money is deducted, then it is -.
Another example of negative numbers would be in stocks. Here is an example. Homer Simpson invest $1000 in stock. If the company he invested in makes profit, then he will get more money. If the company he invested loses money then Homer Simpson will get less than $1000. This is another example of negative numbers. On January 1st it is 59 degrees Fahrenheit. On January 2nd it is 32 degrees Fahrenheit. The change in temperature is 27. These are a few examples which show how negative numbers are used in real life.
The equation 2x-7=15 is like a balance equation. The only difference is that there are 0x's on the right side of an equation, but if it helps; I will put 0x. 2x-7=0x+15. What are you left with if you subtract 0x from both sides? You are left with 2x-7=15. Since the x's were eliminated on the right side, we have to eliminate the units on the left side. Therefore, we must add 7 to both sides. Leaving us with 2x=22. Since we need to know what one x is and not two x, we must divide both sides by 2 leaving us with x=11. =
Now let me further explain. The goal is to figure out what 1x equals. There is no benefit of knowing that 2x-7=15. You MUST attempt to figure out what x is all by itself. There is only one way to get rid of -7, and that is by adding +7. After you do that, you are left with 2x=22. Since x is just a variable, let's think of x as a different variable. Let's use the variable Δ (delta). 2Δ=22. We need to know what Δ is not 2Δ. Therefore we will divide both sides of the equation by 2. This leaves us with Δ=11.
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