Rational number is something that does not have a decimal number going to infinity or something that can be written as a fraction
21.192 can be written as 21 192/1000 so yes its rational
i.e. √2 goes on forever and cannot be written as a fraction. so no it is not rational. it is irrational just like π.
Hope this helps :P
Answer:
you need to isolate t or time
you need to know distance between sun and earth and velocity of them in order to calculate how long it takes for light to travel from the Sun to Earth
Step-by-step explanation:

to find time you multiply t to both sides then you cancel t from where velocity is and you get velocity by itself
now you mulipy d to both side to get v over d and time by itself
1st one on second row I think
Answer:
it will be c because you see the points on the grid if its wrong my bad
Step-by-step explanation:
The correct answer for the problem shown in the figure atttached is the last option (option D), which is shown below:
D.(-x-9i)(x-9i) If you want to verify that the option
D.(-x-9i)(x-9i) is the correct answer, you can apply the distributive property to (-x-9i)(x-9i).
Therefore, when you apply the distributive property, you obtain that the result is:
-x²-81
The graph attached shown this equation, which is a parabola.