Find the value of x that makes abcd a parallelogram.

x=70

Step-by-step explanation:

I'm pretty sure the sum of all angles has to be 360°

and 70+70+40+40=220

so 220+x=360

we figure this out by taking 360-220 which equals 140

and then we divide 140 by 2 which is 70.

To double check, if you add 70+70+40+40+70+70, it equals 360.

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