Answer is 19;
Problem
a1=325 , d=25 , S19=?
Result
S19=10450
Explanation
To find S19 we use formula
Sn=n2⋅(2a1+(n−1)⋅d)
In this example we have a1=325 , d=25 , n=19. After substituting these values into the above equation, we obtain:
Sn19=n2⋅(2a1+(n−1)⋅d)=192⋅(2⋅325+(19−1)⋅25)=192⋅(650+18⋅25)=192⋅(650+450)=192⋅1100=10450
Answer:
7
Step-by-step explanation:
Because 6+6.25=12.25 48.25-12.25=36 6x6=36 6+1=7
Answer: first one
Step-by-step explanation:
25 is .0333% of 750
•25/750 = .03
750 is 3000% of 25
•3000% = 30
Answer:
the last one
Step-by-step explanation:
