Answer:
3x²(4x-3)
Step by step explanation:
Factorise 12x³-9x²
first, find the HCF of the terms.
the HCF is 3x²
Then you can use the HCF to multiply all terms, each divided by the HCF.
3x²(12x³/3x²-9x²/3x²)
Dividing, we'll have
3x²(4x-3)
Answer:
D
Step-by-step explanation:
i took the test trust me
Answer:
1.28 m
Step-by-step explanation:
The speed at which water rises in the tank is proportional to the speed of the water in the pipe and inversely proportional to the ratio of the tank area to the pipe area.
The ratio of tank area to pipe area is the square of the ratio of their diameters:
((150 cm)/(4 cm))² = 1406.25
Then the rate of rise of water in the tank is ...
(0.5 m/s)/(1406.25)
After 1 hour = 3600 seconds, the height of the water will be ...
rise = (time)(rate of rise)
(3600 s)(0.5 m/s)/1406.25 = 1.28 m
Answer:
Step-by-step explanation:
Radius of outer circle = R = 9 cm
Radius of inner circle = r = 5 cm
Area of the shaded region = area of the outer circle - area of the inner circle.
= πR² - πr²
= π(R² - r²) = 3.14*(9² - 5²)
= 3.14 * (81- 25) = 3.14 * 56
= 175.84 cm²
