a rubber ball is thrown upwards with an initial speed of 20m/s. The approximate height o the ball of t seconds is h(t)= 20t-4.9t². Determine the time period, to the nearest hundredth of a second, during which the ball is higher than 8 m. 

the boundary of a linear inequality is 3x+2y=12. The coordinates (2,3) satisfies the inequality so, 

a. a dash line will represent the boundary, but the solution region is unknown 

b. a solid line will represent the boundary, but the solution region is unknown

c. the boundary line type is unknown, but the solution region is above the boundary

d. the boundary line type is unknown, but the solution region is below the boundary

Describe the endocrine basis of SAD. Identify the affected hormone (1 mark) and explain how problems with this hormone due to the lack of sunlight affect individuals with SAD. (2 marks) SAD is a Seasonal Affective Disorder.  I found the hormone and the gland that affects this disorder are Melatonin and the pineal gland.  In the first part it says describe the endocrine basis of SAD. anot sure what theyre asking me to do. help appreciated thank you :) 

if (3,6) lies on the boundry of the inequality y is greater than f(x), the point that must be a solution to teh inequality is 

a. (0,6)

b. (3,3)

c. (3,9)

d. (6,6)

Modern metal cans, like the one shown, are usually made of steel, and then covered with a thin layer of tin. 

A. Write an inequality representing the amount of sheet metal that can be used to make a can that is 10cm tall. 

B. Graph the inequality.

C. Explain how the graph can be used to determine the minimum amount of metal required for cans of various radii.

d. explain a factor that the surface area of a cylinder does not account for. 

e. suggest a change to a surface area of a cylinder inequality that would make it more accurately represent the amount of metal required to make a tin can like the one shown. 

Use the diagram below to answer the question. 

The solution to (x-A)(x-B) less than or equal to 0 is 

a. A is less than or equal to x less than or equal to B, xER

b. B is less than or equal to x less than or equal to A, xER

c. x is greater than or equal to A or x is less than or equal to B, xER

d. x is greater than or equal to B or x is less than or equal to A, xER

Which two endocrine glands are considered to be neuroendocrine glands? (1 mark) Explain your reasoning for each gland separately. (2 marks) These are the endocrine glands:  hypothalamus/pituitary complex • thyroid • parathyroid • adrenal glands • islet cells of the pancreas

I know what an endocrine gland is but what are neuroendocrine glands? i never learned about this; help please and thanks :) 

The diagram below describes the ACTH regulation. Identify 

a patient takes a pill that holds 50 mg of medicine in it.The pill is metabolized or used up, at a rate of 55% every hour.

a.Calculate how much of the pill is left after one hour.

b.rounded to the nearest hundredth, how much of the pill has been used by the body after four hours.

c.if the patient does not take another pill, how much of the pill will the patient use after an infinite amount of time?(nearest hundredth)