X equals 15 because 90-30 equals 60 divide by 4 equals 15
A[1] = 14 . . . . . . . . . defines the first term
a[n+1] = a[n] -4 . . . says each term is 4 less than the one before it
Answer:
172.8
Step-by-step explanation:
to get density its mass over volume so if you mutiply volume by density you get the mass
The answer is given by the empirical rule, 68%.
