Answer:
firstly we have to do cross multiplication
a*2= 6*15
2a = 90
a = 90/2
a = 45
hope my answer is helpful to you
Second step.
To find this, have all the 'ups' as positives and all the 'downs' as negatives, setting up an equation like this:
7 - 3 + 8 - 10 = 2
Hope this helps!
Answer:
Option D is correct.
Explicit formula for the geometric sequence is, 
Step-by-step explanation:
Geometric sequence states that a sequence of numbers in which the ratio between consecutive terms is constant,
we can write a formula for the nth geometric sequence in the form of:
.....[1] where
is the first term and r is the common ratio between successive term.
Given the sequence: 64, 32, 16 , 8......
Here, first term (
) = 64.
Common ratio(r) = 0.5
Since,

,
......
Substitute the value of a and r in [1] we get;

therefore, the explicit formula for the geometric sequence is, 
yan has 4 xavier has zero
15/8 19/12 5/2 is the answer for this problem