57.4 because u add all the side up and u get a answer
Answer:
Step-by-step explanation:
Given the first line has 10 marbles and each following line has one less, the general equation is the nth line will have 10-(n-1) marbles.
So the sixth line has 10-(6-1) = 5 marbles.
The slope is -9y because it has the variable and b= 90
