-7.5 is the answer to the question you were looking for
Answer: This question cannot be answered.
Explanation:
If you add three odd numbers, the sum must also be an odd number. To get an even number, you have to add an even number of odd numbers, e.g. 2 or 4. Adding 3 odd numbers to get 30 is therefore not possible. So the question cannot be answered.
13. r= 16
14. r= 12
15. n= 12
16. k= 0
17. b= -9
18. m= -12
Answer: Option D
D.
; 
Step-by-step explanation:
We know that the cost of preschool is $ 45 per day plus a monthly fee of $ 70.
We also know that a total of $ 880 was paid last month
To write an equation that represents this situation, let us call "d" the number of days that Barry attends school
So the cost was:

Now we solve the equation for the variable d



Therefore answer is the option D
10 4/10 or 10 2/5 if you reduce it