I think the answer would be 1.8
1. 1,2,3,6
2. 1,3,9
3. 1,2,5,10
4. 1,2,3,4,6,12
5. 1,3,7,21
6. 1,2,3,6,9,18
7. 8,16
8. 1,5,25
9. 1,31
10. 3x3
11. 5x5
12. 2x2x2
13. 14 is a composite number
14. 2x2x2
15. 3x5
16. 5 is a prime number
17. 20 is a composite number
18. 2x13
You multiply 8 by 15 then again by 6 so the answer is 720
Answer:
a = -1, b = -2.5
Step-by-step explanation:
Rule for the dilation of a vector
by a scale factor of k is,
(x, y) → (kx, ky)
BY using this rule for a vector
by a scale factor of 2.5
→ 
Followed by the rotation by 90° Or
radians,
Rule for rotation of a vector by 90° is,
(x, y) → (-y, x)
By this rule vector
will become,
→ 
If we represent this vector by
,
Then a = -1 and b = -2.5 will be the answer.