1.2, 3, 7.5, 18.75, ...

Which formula can be used to describe the sequence?

f(x) = 1.2(2.5)x – 1
f(x) = 2.5(1.2)x – 1
f(x) = 1.2(2.5)x
f(x) = 2.5(1.2)x

a(n) = 1.2*(5/2)^(n - 1)

Step-by-step explanation:

The fast growth of this sequence suggests that it's a geometric sequence, not an arithmetic one.

Dividing 3 by the first term, 1.2, yields 5/2.  Multiplying the second term, 3, by 5/2 yields 7.5, which agrees with the given sequence.  Thus, we have found and confirmed the common ratio:  It is 5/2, and the first term is 1.2.

Thus, the explicit formula for this ratio is

a(n) = 1.2*(5/2)^(n - 1)

This is equivalent to answer choice f(x) = 1.2(5/2)x – 1.  Note that you MUST enclose your  " x - 1 " in parentheses here, obtaining:

f(x) = 1.2(5/2)^(x – 1).  The exponentiation symbol " ^ " is also mandatory.

"f(x) = 1.2(2.5)x-1"

Step-by-step explanation:

t = 3

step-by-step explanation:

put t = 3 in this expression :

(3²-1)(3²-2)(3² - 3)(3² - 4) = 8×7×6×5 = 56×30 = 1680

answer: input the dimensions of the room to be painted. click the button to calculate the amount of paint and man-hours needed for this job.

interior paint coverage depends on the brand of paint used. the coverage amount is listed on the label of the paint can. use this to adjust the values in the paint coverage section below. paint usually is applied at 350 to 400 square feet per gallon (primer at 200 to 300 square feet per gallon).

step-by-step explanation: