Answer:
1.08
Step-by-step explanation:
to divide to fractions multiply one by the reciprocal of the other.
3/4 x 13/9 = 1.08
Answer:
Using the formula
C=2πr
Solving for r
r=C
2π=35
2·π≈5.57042
Step-by-step explanation:
Answer:
Tn=12n(n+1)
Step-by-step explanation:
Explanation:
These are the triangular numbers - each term in the sequence being the sum of the first n positive integers:
T1=1=1
T2=3=1+2
T3=6=1+2+3
etc.
Notice that:
2Tn=(0)+1+(0)+2+...+(n−1)+(0)+n
2Tn+(0)+n+(n−1)+...+(0)+2+(0)+1
2Tn=(n+1)+(n+1)+...+(n+1)+(n+1)
2Tn=n(n+1)
So:
Tn=12n(n+1)
40:28 is equivalent to 10:7
