$20.50 x .3 = 6.15
20.50 - 6.15 = $14.35
The book is now $14.35
1 ,3 and 4 are correct :)
Answer:
1.5
Step-by-step explanation:
Given the pair of points on the table.
Now the formula for slope, 
To calculate the slope we only require two pair of points.
Let us take: 

The slope of the linear function represented by the values in the table is 1.5.
Note: You can use any two set of values. The result will be the same.
4.4 + (4 × 14 + 8.6)
Follow the order of operations (PEMDAS).
4.4+(56+8.6)
4.4+(64.6)
answer: 69