In order for two linear lines to be perpendicular, the product of their gradient must be -1.
Let's take y = x + b and y = -x + b
This is already in the form: y = mx + b, where m is 1 and -1 respectively.
Since the product of their gradient is -1, they are said to be perpendicular.
The third one duhhh, Ik this stuff
Numbers can be ordered in ascending or descending order.
The length of fishes from greatest to least is
Given



Convert all fractions to decimals



Arrange from greatest to least



<em>Hence, the length of fishes from greatest to least is </em>

Read more about order of numbers at:
brainly.com/question/3729546
X + 0.12x = 31360
1.12x = 31360
x = 31360/1.12
x = 28,000 <===