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3 years ago

HELPPPPP!!!!! PLSSSS!!! 10 POINTS!

Mathematics

2 answers:

Serga [27]3 years ago

6 0

Answer:

divide 81 by pi and then by 2

Step-by-step explanation:

Mandarinka [93]3 years ago

6 0

Answer:

C= 2pi x R

81= 6.28 x r

81 % 6.28 = r

r =12.89

Step-by-step explanation:

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3 years ago

Carol began with $50 in her bank account and then added an additional $10 a month. Select the algebraic model that describes b,

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olga55 [171]

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3 years ago

PLEASE HELP!!

e-lub [12.9K]

Answer:

Part 1) The inverse function is $f^{-1}(x) =\frac{2x-3}{4}$

Part 2) 25.75 weeks

Step-by-step explanation:

Let

x ---->the number of weeks in the course

f(x) ---> the number of assignments he has completed

we have

$f(x)=\frac{4x-3}{2}$

Part 1) Find the inverse

Let

y=f(x)

$y=\frac{4x-3}{2}$

Exchange the variables (x for y and y for x)

$x=\frac{4y-3}{2}$

Isolate the variable y

$2x=4y-3\\4y=2x+3\\\\y=\frac{2x+3}{4}$

Let

$f^{-1}(x) =y$

$f^{-1}(x) =\frac{2x+3}{4}$

Part 2) we have

$f^{-1}(x) =\frac{2x+3}{4}$

where

$f^{-1}(x)$ ---->the number of weeks in the course

x ---> the number of assignments he has completed

For x=50

substitute in the inverse function

$f^{-1}(x) =\frac{2(50)+3}{4}=25.75\ weeks$

Note: Juliana don't need to use the inverse function. you can just use the function you have where f(x)=50 assignments and solve for x to get the amount of weeks.

$50=\frac{4x-3}{2}\\\\100=4x-3\\4x=103\\x=25.75\ weeks$

6 0

4 years ago