Please please help me out Given t4 = 187.5 and r = 2.5

a. Find the value of t1.

b. Write an explicit formula for this sequence.

c. Find the value of t18.

a)

b) The explicit formula

c) t₁₈  = 69,849,193.096

Step-by-step explanation:

Step(i):-

Given that the geometric sequence

          r = 2.5

Given the fourth term of the  geometric sequence

⇒ ar³ = 187.5

⇒ a (2.5)³ = 187.5

The explicit formula

Step(ii):-

put n=1

The of the geometric sequence

t₁₈  = 69,849,193.096

Final -

a)

b) The explicit formula

c) t₁₈  = 69,849,193.096

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq