Last one tonight! for your iris!

a) 1200

b) +15

Step-by-step explanation:

The given equation is

The cost to get started is the initial cost(y-intercept) which is .

The change in total cost for each book printed is the slope of the line which is

The answers are:

For the first question, if there is no printed book, the variable x will be 0, so:

The cost to get started, meaning that there is not any printed book, is $1200

For the second question, to determine the change in the total cost for each printed book, let's assume that there is just one book printed, so:

So, the change for each printed book is $15(+) because:

Have a nice day!

2. angles qrt and qst both measures 156 degrees.

step-by-step explanation:  

we have been given a diagram of a circle and we are told that measure of arc qvt is 156 degrees.  

we can see from our given diagram that angle qrt and angle qst subtends to arc qvt.

since we know that angles subtended by the same arc at the circumference are always equal.

by angle subtended by same arc theorem, measure of angle qrt and angle qst will be equal to the measure of arc qvt.

therefore, angles qrt and qst both measures 156 degrees and 2nd statement is the correct choice.