220 pages in 3 hours
20 pages very 30 minutes so
So 1.5 minutes per page
870/2 = 435
130/435 = 26/87 = 0.5977 cm
The sum of complementary angles is 90 degrees, thus
3x + 6 + 3x + 18 = 90
=> 6x + 24 = 90
=> 6x = 90 - 24 = 66
=> x = 66 / 6 = 11
=> m<A = 3(11) + 6 = 33 + 6 = 39 degrees.
The answer is -6. Thought there is a chance I am wrong. Need an explanation?