28
1
38
Five
It will be the same as the original number.
7
She halved "fifty", to get twenty five, then added ten to get thirty five.
1
38
Five
Kinetic energy is determined by mass and velocity. The velocity is halved if you double the original mass, so the kinetic energy stays the same (unless the mass added has the same kinetic energy in the observer's reference frame as the original mass).
The number is eighteen.
It will be the same as the original number.
A natural number is doubled when added to its reciprocal. Find that number!
Two negative numbers added together result in a negative number.
7
The volume will be halved and the surface area will be halved but with the base area of pi*radius2 added to it
Number + additive inverse of number = 0, by definition (the additive inverse of a number is that number, which when added to the original number, results in a sum of 0) Number + additive inverse of number = 0, by definition (the additive inverse of a number is that number, which when added to the original number, results in a sum of 0)