18. if the product of two integers is odd, then both must be odd integers. prove by contradiction, where p is prime number. a 19. 2 is an irrational number. 20. 5 is an irrational number. 21. p is an irrational number. *22. log102 is an irrational number. prove by cases, where n is an arbitrary integer and x denotes the absolute value of x.

use formula for the circle a=3.14

step-by-step explanation:

i dont know sorry

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

dilation scale factor 2: starting with δabc, draw the dilation image of the triangle with a center at the origin and a scale factor of two. notice that every coordinate of the original triangle has been multiplied by the scale factor (x2). dilation with scale factor 2, multiply by 2.