Answer:
10
Step-by-step explanation:
Determinant = ad - bc

Answer:
B
Step-by-step explanation:
Initial mean = 156, Changed mean = 163.92
So, mean increases. Only condition that satisfies this is B.
Answer:
11.
Step-by-step explanation:
9 right, and 2 up
Answer:
16 year olds had the higher ratio of black belts to brown belts.
Step-by-step explanation:
15 year olds: 8/28 students had black belts
8/28 = 28.6% had black belts
16 year olds: 10/27 students had bald belts
10/27 = 37.0% had black belts
Answer: 4a⁴b⁵
Step-by-step explanation: