MATHEMATICS MIDDLE SCHOOL

1. Why is it useful to know the definition of rational expression? Explain through an example of your own.

Answers

Answer 1

Answer:

Step-by-step explanation:

Rational expressions are in the form of $(p)/(q),q\neq0$

Here from the definition it is very important to know that the denominator of a rational expression is never zero.

If the denominator is zero then it becomes undefined.

Let us take an example of a rational expression.

$(x+4)/(x+2)$

This is a rational expression and it is defined only when

$x+2\neq0\n\n\Rightarrow x\neq-2$

It means that the expression is defined for all real values of x except x =-2

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85% of 20 is what number

Answers

85% of 20 is 17

Convert the percentage to a decimal:
$(85)/(100) = 0.85$

Multiply your decimal and 20:
$0.85 * 20 = 17$

Complete the statement. –5 + __ = –5

Answers

The answer is 0
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-5+0=-5 if you added any number (positive or negative) the answer couldn't be 5 anymore

A scientist studies a pod of humpback whales to determine themigration of humpback whales. What is the population?

A. all whales
B. a pod of humpback whales
C. killer whales
D. all humpback whales

Answers

Answer is D !! Hope this helpsss

I live on the 15th floor of an apartment building. My friend, Emily, comes to visit me every Saturday. Last year she would always ride the elevator to the 7th floor and walk up the rest of the way. This year she rides the elevator to the 9th floor and the walks the rest of the way. Why does she do this? (Additional clue: On rainy days she rides the elevator all the way up to the 15th floor).Help Please