Answer:
Step-by-step explanation:
Area of circle=Pi times radius^2
Diameter is half of radius=8.4
Pi*8.4^2=221.670777637
Hope this helps!
Answer:
The last term on the paper after 50 students = 
Step-by-step explanation:
The general term of the equation:
Here, the first term = 1
Second term = 2(1) + 1 = 3 = 4 - 1 = 
Third Term = 2(a2) + 1 = 2(3) + 1 = 7 = 8 -1 = 
Fourth term = 2( a3) + 1 = 2(7) + 1 = 15 = 16 - 1 = 
Continuing this way, we get
Last term : 
So, the 50th term of this sequence is

Hence, the last term on the paper after 50th student changes it = 
No, 21 is a multiple of 7
Expand the squared binomials:


Then





Answer:
15cm
Step-by-step explanation:
scale factor =image diatace/object distance
0.75=x/20
0.75×20=x
15=x
: .x=15cm