Dave has $358 in his bank account. He wants to prepay his cell phone bill for the next three months. His monthly cell phone bill is $78. He also needs to pay his electric bill, which is $135. How much money will Dave need to add to his account to cover all his bills?

$11

Step-by-step explanation:

Given data

Total amount=  $358

Monthly cell phone bill= $78

      Bill for the three months = 78*3= $234

      Electtrcilty bill = $135

      Total bills= $234+ $135=$369

Hence, the amount to be added= 369-358 =$11

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