Answer:
$28.50
Step-by-step explanation:
$38.00 x 0.75 = $28.50
For polynomials, if we say of "rate of change", we are talking about the slope of the tangent line. That is the value of dy/dx or the differential of y in terms of x. From the given choices, the answer would be the second choice, y = 19x - 10. This is because dy/dx in this item is essentially equal to 19 which is a constant.
The cost would be $31.50 because in this case 30% is 13.5.