Answer:
<h2><em><u>-9</u></em></h2>
Step-by-step explanation:

<em><u>By</u></em><em><u> </u></em><em><u>putting</u></em><em><u> </u></em><em><u>the</u></em><em><u> </u></em><em><u>values</u></em><em><u> </u></em><em><u>of</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>-4</u></em><em><u> </u></em><em><u>,</u></em><em><u> </u></em><em><u>b</u></em><em><u> </u></em><em><u>=</u></em><em><u> </u></em><em><u>9</u></em><em><u>,</u></em>



= -(9)
= <em><u>-9 (Ans)</u></em>
There are 8 letters and 3 of them is a vowel.
P(not consonant) = P(vowel) = 3/8
A is the correct choice.
4. 2/8 = 1/4
6. 5/10 = 1/2
8. 8/18 = 4/9
10. 6/16 = 3/8
12. 10/12 = 5/6
14. 12/15 = 4/5
Answer:
18
Step-by-step explanation:
Let number of girls be 'x'.
So, Number of boys = Number of girls - 4
= x - 4
Total number of students in a class = 40
Number of girls + Number of boys = Total number of students in a class
x + x - 4 = 40
2x - 4 = 40
2x - 4 + 4 = 40 + 4
2x = 44

x = 22
Number of boys = 22 - 4
= 18