Which of the following represents a geometric sequence?
a. 1/4, 1/4, 1/4, 1/4
b. 1/4, 1/5, 1/6, 1/7
c. 1/4, 1, -4, 16
d. 1/4, -4, 1/4, -4

 Option 'A' is correct.

Step-by-step explanation:

Since we need to find the geometric sequence ,

For this we find the " common ratio" :

On the other hand, in options 'B' , 'C' and 'D' , there is no common ratio,

Hence, Option 'A' is correct.

b. 2

step-by-step explanation:

the slope of a line =δy/δx

δy= y₂-y₁

δx= x₂-x₁

therefore, using the points (-2,-3)   and (3,7) we can calculate gradient as follows:

m=(7--3)/(3--2) (a number minus a negative number the sign changes to a plus)

m=(7+10)/(3+2)

=10/5

=2

no solution

step-by-step explanation:

there is not enough information in the problem to solve.