The Exact answer is 12.80625, Rounded to the tenth is 12.8
Notice that
so that for each power of 2, there is a pattern of period 4. This means that for integers
, each of
,
,
, and
have the same units digit.
We can write
, and since
, it follows that
and
share the same units digits. So the units digit of
is 8.
X = 12
12-6-4=2....................
Answer: 90 cm cubed
Explanation: The formula for this is you find the area of the face and muliply it by the height of the shape. So 1/2 (4) (3) = 6 x 15 = 90.
Hope it helps