Find the area of a classroom whose length 12m and width 7m

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Sketch one cycle if the cosine function y=2cos2theta