The selling price of an item is $660. It is marked down by 30%, but this sale price is still marked up from the cost of $420. Find the markup from cost to sale price.

$42

Step-by-step explanation:

We must calculate the value of the discount percentage, that is, 30% of 660, like this:

660 * 30% = 198

Now we must subtract that value from the sale price, like this:

660 - 198 = 462

In other words, the surcharge would be:

462 - 420 = 42

The surcharge value would be $ 42

2.56 is the width of the garden

step-by-step explanation:

1 number

if we use a graphing calculator, there is only one such number that satisfies the conclusion of the mean value theorem, that is, a number such that

where the right-hand side is the average rate of change of f on the interval [0.5,0.75], which is the slope of the secant line.

in the attached graph, the black line is the secant line which has its slope as the average rate of change of f on [0.5,0.75], while the orange line is the only tangent line to the graph of f in the interval that satisfies the mvt conclusion.