<em>( 5 - 2i ) ( 4 - i ) </em><em>18 - 13i</em>
<em>( 2 - 5i ) ( 1 - 4i ) </em><em>-18 - 13i</em>
<em>( 1 - 4i ) ( 5 - 2i ) </em><em>-3 - 22i</em>
<em>( 4 + i ) ( 2 - 5i ) </em><em> 13 - 18i</em>
Answer:
10 incorrect answers
Step-by-step explanation:
Correct answer = +3
Incorrect answer = - 1
Mark scored = 20
Number of correct answers = 10
Let:
Incorrect answers = y
Hence, we can fashion out the expression for total score :
(Number of correct answers * score per Correct answer + number of incorrect * score per incorrect) = total score
(10 * 3) + (y * - 1) = 20
30 - y = 20
-y = 20 - 30
-y = - 10
y = 10
10 incorrect answers
Divide 3 1/2 by 2/3. 3 1/2 = 7/2 as an improper fraction, so we have 7/2 ÷ 2/3 = 7/2 * 3/2 = 21/4 = 5 1/4 L
