A = pi r^2
A = 3.14 x 7^2
A = 3.14 x 49
A = 153.86
Answer:
y=7x+yx-1
Step-by-step explanation:
Answer:
The general form of geometric series is ⇒ 
Where a is the first term and r is the common ratio
The sum of n terms of the geometric series is ⇒ 
For the given geometric series 2, 8, 32, 128
The first term is a = 2
The common ratio r = 8/2 = 32/8 = 128/32 = 4
So, 
And the sum of the given terms:
n = 4
∴ 
90. For the first position,you can have one of 10 ppl in president/vice president. Then the remaining 9 ppl can be put in the remaining position. 10 * 9 = 90. If you need more explantion check these keywords. Factorial, permutations, combinations.