A child attempts to open a five-disc lock, each disc having digits 0 to 9. He
takes 5 sec to dial a particular
number on the disc. If he does so for
5 hrs everyday, the number of days in
which he would be sure to open the
lock will be (Assume that he does not
repeat the number he has tried
earlier.)
A
30
B
28
C
27

. In conclusion, people have to become aware of the dangerous impact fossil fuels have on a long term, and how important it is to shift slowiy to renewable energy resources. However, since the use of renewable energy is a rather new development, it carries the weight of critics and careful long term observation. COuntries have to show commitment to renewable energy and have to evaluate which energy resources are cost-effective and the best with regards to their circumstances The only hindrance of using more renewable energy resources in future could be the finances to install these technologles.

what are the units silly

Step-by-step explanation:

definition: a circle is the  set of all points in a plane that are equidistant  from a given  point  called the center of the circle. we use the symbol ⊙ to represent a circle. the a line segment from the center of the circle to  any point  on the circle is a radius of the circle.

step-by-step explanation:

i googled it and this is what i got i don't know how it is. sorry.

20

step-by-step explanation: