70,000+9,000+30+1
Seventy thousand nine hundred thirty one

As we know, slope (m) is equal to tan θ for a straight line :


So, we can say that it's a positive constant slope
Find the total price
original price × sales tax
33 × 0.04 = 1.32
Add original price & sales tax
33 + 1.32 = 34.32
Hisako will pay $34.32 for her doll.