Explanation:
In order to compute correctly the sum of the two terms, we have to rewrite one of them such that they have the same exponent.
The two terms are:


For instance, we can re-write the second term such as it also has a power
. In order to do that, we have to move the decimal point one place to the left, therefore:

At this point, the two numbers have the same exponent, so we can just add them together by adding the bases and keeping the same exponent, -2:

A=pi r^2
A=( 3.14159.......)(12.77)^2
A= 512.30m^2
I think it would be plum pudding, solid ball, solar system.
Answer:
c
Explanation:
electronic balance must always be at zero to prevent errors in measured value
Motion is the correct word that fits in.
Hope this helps.