Bill enters a 30 kilometer race. He runs the first 20km at a speed of x kilometers per hour and the last 10 km at (x-5) kph. His total time for the race was 4 hours a.) Write down an equation in terms of x and solve it.
b.) What are his speeds for the two parts of the run?

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.

nada

step-by-step explanation:

what