Answer: C and B
Step-by-step explanation:
B. Y could be inversely varying with X
The system:
3 x + 4 y = 40
x + 6 y = 18,
-------------------
x = 18 - 6 y
3 ( 18 - 6 y ) + 4 y = 40
54 - 18 y + 4 y = 40
54 - 40 = 18 y - 4 y
14 = 14 y
y = $1
x = 18 - 6
x = $12
Answer: Each DVD costs: $12.
Answer:
-9
Step-by-step explanation:
They all follow the same sequence such as -9 for ex 47-9 is 38
4/3 · 2.57³ π · 7,860 = 4/3 · r³ π · 2,700 / : 4/3 π
2.57³ · 7860 = r³ · 2,700
r³ = 2.57³ · ( 7,860 : 2.700 ) = 2.57³ · 2.911111... /∛
r ≈ 2.57 · 1.428 = 3.67 cm
Answer: Radius of a solid aluminium sphere is 3.67 cm.