DaniGhurlviz
Answered

if 30 and 90 are the geometric means of a given sequence, what are the value of the first and last term?
a. 7 & 240
b. 8 & 250
c. 9 & 260
d. 10 & 270​

Sagot :

AGboiiviz

Answer:

D. 10 and 270

Step-by-step explanation:

Given the geometric sequence:

let a1= first term

a4= last term

a1 , 30 , 90 , a4

looking at the given the common ratio of the sequence is 3 or simply 90 ÷ 30 = 3

we get, a1= 30÷3

a1= 10

a4= 90 x 3

a4= 270

Hence, Option D is the answer

#CarryOnLearning

Ezekiel69420viz

Answer:

if 30 and 90 are the geometric means of a given sequence, what are the value of the first and last term?

a. 7 & 240

b. 8 & 250

c. 9 & 260

d. 10 & 270