Explain how you found your answer

Mathematics

1 answer:

pshichka [43]3 years ago

3 0

Answer:

let the total cost of a rug be x

then

30% of x =75

30/100*x =75

3x=750

x=750/3 = 250

Marc owe = 250-75 =175

Step-by-step explanation:

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For the function f(x)=x+9/7-4x find f^-1(x)

Liula [17]

Answer:

Step-by-step explanation:

$f(x)=\frac{x+9}{7-4x} \\put ~f(x)=y\\flip~x~and~y\\f(y)=x\\y=f^{-1}(x)\\y=\frac{x+9}{7-4x} \\flip~x~and~y\\x=\frac{y+9}{7-4y} \\x(7-4y)=y+9\\7x-4xy=y+9\\-4xy-y=9-7x\\or\\4xy+y=7x-9\\y(4x+1)=7x-9\\y=\frac{7x-9}{4x+1} \\or~f^{-1}(x)=\frac{7x-9}{4x+1}$