The temperature is noon is 75° fahrenheit. the temperature drop 3° every half hour what is the temperature at 4 pm.

75 degree minus 3 degree half hour  

=75-8(3)

There are 8 half hours in 4 hours  

=75-24

=51

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.

x = 3 ± √(5+y)