Which of these is not a reasonable fitness goal?
a. i want to exercise for 3 hours every day.
b. i want to exercise for 30 minutes, five days a week.
c. i want to be able to do 50 sit-ups in a row by next month.
d. i want to be able to run 1 mile in 12 minutes.

I think A

Explanation:

I'm not sure but all the other ones seem reasonable and exercising 3 hours a day is a bit much I'm not sure it might be D but I cant really say that because I'm a cross country runner and 12 minutes a mile isn't bad

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true