What is my mystery number??? My number has 2 digits
It is less than 30
It is odd
The sum of its digits is 7
that could my mystery number be??

25

Step-by-step explanation:

To figure out the mystery number, the biggest clue we have is the fact that the number is a double digit and the 2 integers add up to 7. We can list out the possible ways to get a sum of 7. Then we can see which is the mystery number.

0+7

1+6

2+5

3+4

With these pairs, we can automatically eliminate 0+7 because 70 is greater than 30. We can also eliminate 3+4 because 34 is even, not odd. When you flip it to 4+3, it is odd, but it is greater than 30. We can also eliminate 1+6 because 16 is even and 61 is greater than 30. Our answer is 25. 2+5=7 and 25 is odd that is less than 30.

b.an increase in a causes b to decrease

if you explain the the question more correctly i might be able to answer this better

step-by-step explanation: