I NEED HELP PLS WITH THIS MATH QUESTION ASAP The Coat on Sale Harris's Department Store was
trying to sell a winter coat which
n o one seemed to want. First, they
tried to sell it for 20% off the
marked price, but no one would
buy it. Then, they tried to sell it for
25% off the first sale price, but still
no one would buy it. Finally, they
offered it for 30% off of the second
sale price, and someone actually
bought the coat for $21.
What price did Harris's originally
try to sell the coat for?

$50

Step-by-step explanation:

To get previous prices, divide by what you would have multiplied to get the next price. X*.70 (that’s 30% off)=21. So... 21/.70=X. Repeat for each price change... (((21/.7)/.75)/.8)=$50.

the answer is 510

step-by-step explanation:

15 • 13 = 195

15 • 12 = 180

15 • 5 = 75

12 • 5 = 60

195 + 180 = 375

375 + 75 = 450

450 + 60 = 510

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.