A cone with a height of 9 cm has a volume of 48π cm3. What is the radius of the cone? (The volume of a cone is given by the formula V = 1 3 πr2h.) A) 2 cm B) 3 cm C) 4 cm D) 6 cm

4cm

Step-by-step explanation:

given volume = 48πcm³

height = 9cm

r = ?

the formula for finding the  volume of a cone  = 1/3 πr²h

v = πr²h/3

make r" the subject of the formula

by cross multiplying,

3v = πr²h

divide both sides by  πh

3v/πh =r²

r = √3v/πh

r= √3 × 48π/9π

π cancels π

r = √144/9

r = 12/3

r = 4cm

therefore the radius of the cone is 4cm

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m

45

step-by-step explanation:

to find a percentage, add a decimal in front and multiply it by the other number.

.25 times 180= 45