What is the diameter of the cirlce if the radius is 7

14

Step-by-step explanation:

The diameter of a circle is twice its radius

d=2r

Substitute 7 in for r

d=2*7

d=14

So, the diameter is 14

Hope this helps! :)

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

step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}