If the class mark and class size of the class interval are 25 and 10 respectively, then the
class interval is

The class interval is: 20-30

Step-by-step explanation:

Let l be the lower class limit and u be the upper class limit.

Then according to given statement that class mark is 25

And

Class size is 10

So, the second equation will be:

Adding equation 1 and 2

Now putting u =30 in equation 1

A class interval is written in the form that lower limit comes first and upper limit comes second.

So,

20-30

Hence,

The class interval is: 20-30

idk

step-by-step explanation:

use that smart brain

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right