The ratio of D's to A's in the school was 4 to 83. If there were 166 A's in the school this term, how many D's were there?

8

Step-by-step explanation:

Create a proportion, where x is the number of D's:

=

Cross multiply and solve for x:

83x = 664

x = 8

So, there were 8 D's

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.