Answer:
H0 : u = 45
H : u not equal to 45
This is because the topic of claim or contention is that the average minutes a student need to complete the statistics exam is 45mins
0 = x^2 + x - 72
x^2 + x - 72 = 0
x^2 + 9x - 8x - 72 = 0
X (x + 9) - 8 (x + 9) = 0
(X + 9) (x - 8) = 0
X + 9 = 0
X = -9
X - 8 = 0
X = 8
X (-9,8)
Answer is Option D
x = -9 or x = 8
The first option
hope this helps<3
There are three simple steps to add fractions:
1. Make sure the bottom numbers (denominators) are the same
2. Add the top numbers (numerators) put the answer over the denominator
3. Simplify the fraction (if needs)