Answer:
The correct answer is "
".
Step-by-step explanation:
According to the question,
Number of students,
= 35
A ! mid term A,
B : final A,
Didn't start,
Now,
⇒ 
then,
⇒ 
hence,
The probability will be:
⇒ 
⇒ 
7. -20
10 3
6 3
Subtract each remember 4-- -6= 10
Answer:
B
Step-by-step explanation:
Given a quadratic equation in standard form
ax² + bx + c = 0 ( a ≠ 0 )
Then the discriminant is
Δ = b² - 4ac
• If b² - 4ac > 0 then 2 real irrational roots
• If b² - 4ac > 0 and a perfect square then 2 real rational roots
• If b² - 4ac = 0 then 1 real double root
• If b² - 4ac < 0 then 2 complex roots
Given
x² + 3x - 7 = 0 ← in standard form
with a = 1, b = 3, c = - 7 , then
b² - 4ac
= 3² - (4 × 1 × - 7) = 9 + 28 = 37
Since b² - 4ac > 0 then 2 real irrational roots
N=25 because 20 divided by 4 is 5 which is 1/5 of n meaning 5x5 is 25
Divide both sides with 9
s = 16
