TO get the decimal 8 is obviously 8.0 and for 21/40 just divide 40 for both the numerator and denominator. Then add the 8.0 with the answer you get for 40 together to get the final answer.
5/6 - 1/3 × 7/8
5/6 - 7/24
20/24 - 7/24
13/24
do the multiplication first
Answer : E ; 105 square feet
Explanation : 7 x 15 = 105
Complementary angles add up to 90 degrees.
The complement of 57 is (90 - 57) = 33 degrees.