Answer:
x=-8.5
Step-by-step explanation:
I believe that is gonna be the 225 package.
Thats the lowest number that both 25 and 9 go into
The common difference is 4. U know that the formula is the first term + d(n -1). N-1 is 14 so u know that 14 times a number needs to equal 56 because the first term is -3 and 56-3 is 53. 14 * 4 is 56. So the common difference is 4