Answer:
True!
Step-by-step explanation:
3(10) - 9
30 - 9
21
Answer:
I think it's C a triangular pyramid.
Aas i belive . If not consult the other answer
Answer:

Step-by-step explanation:
Jeremy rides a Ferris wheel. The graph shows h, Jeremy’s height above the ground at any time during the ride
Number line represents the height above the ground at any time during the ride.
the shaded part of the graph lies between 10 and 50, also we have solid dot at 10 and 50.
So height of the inequality is

The sum of the first n natural numbers and 0=
n*(n+1)/2