19^2 + x^2 = 21^2
19^2 = 361
21^2= 441
361 + x^2 = 441
x^2 = 441-361 = 80
x = sqrt(80) = 8.944 round to nearest tenth = 8.9
The irrational numbers are: √8, √10 and √15
Step-by-step explanation:
A rational number is a number that can be written in the form p/q where p&q are integers and q≠0.
"All the numbers whose square root is not a whole number and has an infinite number of digits after decimal, are irrational numbers"
So in the given options

Which can be written in the required form so √4 is a rational number

√8 has an infinite expansion hence it cannot be written in the p/q form, so it is an irrational number

√10 has an infinite expansion hence it cannot be written in the p/q form, so it is an irrational number

√15 has an infinite expansion hence it cannot be written in the p/q form, so it is an irrational number

Which can be written in the required form so √36 is a rational number
Hence,
The irrational numbers are: √8, √10 and √15
Keywords: Rational numbers, Irrational numbers
Learn more about rational numbers at:
#LearnwithBrainly
Answer:
23. a-T b-F
24. Words- *3* times the number of *feet*
Variable- Let *y* represent the number of *yards*
Model- (I can't do it)
Expression- The number of feet in*3* yards is given by the expression *3y*
25. 7.8
26. 8.3
27. 14.5
28. Yes. The communitive property tells us that we can switch any two numbers in a multiplication or addition problem
*I did that page like a month ago*
Answer:
idk lol
Step-by-step explanation: