Answer:

Step-by-step explanation:

Combine like terms

Distribute the 7

Subtract 3m from each side

Add 7 to each side

Divide by 4

Answer:
In physical sciences, mechanical energy is the sum of potential energy and kinetic energy. It is the macroscopic energy associated with a system. The principle of conservation of mechanical energy states that if an isolated system is subject only to conservative forces, then the mechanical energy is constant.
hope it helps ;)
Answer:
Um.. Im not sure about this one.. you're in college?
Step-by-step explanation:
Answer:
And we can find the probability with the complement rule and the normal standard distirbution and we got:
Step-by-step explanation:
Let X the random variable that represent the time spent reading of a population, and for this case we know the distribution for X is given by:
Where
and
We are interested on this probability
And we can use the z score formula given by:
Using this formula we got:
And we can find the probability with the complement rule and the normal standard distirbution and we got: