What is a variable?
A variable is an unknown number.
Explain why in subtraction, the subtrahend must be larger than the minuend.
In subtraction, the subtrahend must be larger than the minuend because you can only subtract a smaller number from a larger number. Their positions cannot be switched as in addition.
Compare and Contrast gravity and friction. Be sure to include at least 2 ways they are alike and 2 ways they are different. Examples should also included.
Gravity and Friction are alike in that they are both forces. They affect our daily lives a great deal. However, whereas friction helps things move, such as cars, gravity holds things in place only. In addition, we can live slightly without friction, but it would be more difficult to function without gravity.