Answer:
36 pi cm^2
Step-by-step explanation:
The circumference of a circle is given by
C = 2 * pi *r
12 pi = 2 * pi *r
Divide each side by 2 pi
12 pi /2 pi = 2 * pi *r
6 = r
The area of a circle is given by
A = pi r^2
A = pi (6)^2
A = 36 pi
(7x-y)(x+4y) that’s your answer
Answer:
Hey! :)
Step-by-step explanation:
You could create a wave with a higher frequency on a rope by wiggling up and down at a faster rate, the wave should become shorter. Clearly you will find a relationship between wave length and frequency :)
*✿❀ ❀✿****✿❀ ❀✿****✿❀ ❀✿****✿❀ ❀✿****✿❀ ❀✿**
Have a nice day! :)
Answer:
Below in bold.
Step-by-step explanation:
First term a1 = 13
11th term a11 = a1 + 10d = 83
So a1 + 10d - a1 = 83 - 13
10d = 70
d = 10
The common difference d = 7.
Sum of n terms = (n/2)[2a1 + (n - 1)d]
Sum of the first 20 terms:
S20 = (20/2)[2*13 + (20-1)7]
S20 = 10 *(26 + 19*7)
S20 = 10*159 = 1590.