Answer:
1953125
Step-by-step explanation:
5: 625
6: 3125
7: 15625
8: 78125
9: 390625
10: 1953125
Sequence
×5
Answer:
D (I think)
Step-by-step explanation:
I used a right triangle calculator and that was the answer
Below is the process the calculator did, hope it helps.


The pythagorean theorem equation is a^2 (a squared) + b^2 (b squared) = c^2 (c squared)
so a^2+b^2=c^2
Set equal to eachother
(2x+1) = 79
Subtract 1 from both sides
2x=78
Divide 2 from both sides
2x/2=78/2
X= 39