Position in the sequence triangular number relation
1 1 1 = 1*(1+1)/2
2 3 3 = 2(2+1)/2
3 6 6 = 3(3+1)/2
4 10 10 = 4(4+1)/2
5 15 15= 5(5+1)/2
Call n the position in the sequence, then the triangular number is: n(n+1)/2
Answer: 40150000
Step-by-step explanation:
Hi
The answer is <em>D. 39 degrees. </em>The area where b is shows an acute angle. The only answer shown with an acute angle is 39. 141 and 180 are obtuse angles, and 90 is a right angle.
Answer:
D. 0.65
Step-by-step explanation:
Do 52/80 to get the answer which is D.