Can someone help me with this?

7

Step-by-step explanation:

Calculate and sum up the first three terms.

We get:

4[ (1/2)^(1-1) + (1/2)^(2-1) + (1/2)^(3 - 1) ], OR

4[ 1               + (1/2)                + (1/2)^2 ], or

4[1 + 1/2 + 1/4}  = 4[7/4] = 7

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

deez nu tz

step-by-step explanation: