Which of the following statements best describes the role of hormones in the body?
hormones send chemical signals throughout the body to regulate other body processes.
hormones are chemical signals that are sent throughout the body to regulate other body processes.
hormones send electrical signals throughout the body to regulate other body processes.
hormones are electrical signals that are sent throughout the body to regulate other body processes.

The correct answer is: Hormones are chemical signals that are sent throughout the body to regulate other body processes.

Explanation:

Hormones are chemical substances released by the glands (example: the thyroid gland releases Triyodothyronine (T3) and Thyroxine (T4)) which allow certain tissue to regulate.

complete the square on the right side of the equation;

-5(x + 0)^2 + 15

answer: d. y = -x^2 + 15

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.