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Jlenok [28]
2 years ago
6

Which function is the inverse of Rx) = 8x + 4?

Mathematics
2 answers:
Westkost [7]2 years ago
7 0

Answer:

D

Step-by-step explanation:

let y = f(x) and rearrange making x the subject

y = 8x + 4 ( subtract 4 from both sides )

y - 4 = 8x ( divide both sides by 8 )

\frac{y-4}{8} = x

Change y back into terms of x with x = f^{-1} (x)

f^{-1} (x) = \frac{x-4}{8} → D

babunello [35]2 years ago
5 0

Answer:

B.~f^{-1}(x)=\frac{x-4}{8}

Step-by-step explanation:

To find the inverse of a function, swap the places of the x and y variables and solve for y again.

x=8y+4\\x-4=8y\\\frac{x-4}{8}=y

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A delivery service charges $1.25 for
choli [55]

Answer: 6\ \text{miles}

Step-by-step explanation:

Given

A delivery service charge \$1.25 for each delivery

and an additional \$0.75 for each mile traveled

Suppose, x miles are covered

The charge is given by

\Rightarrow 5.75=1.25+0.75x\\\Rightarrow 4.5=0.75x\\\Rightarrow x=6\ \text{miles}

Therefore, driver traveled 6 miles for delivery

8 0
3 years ago
It takes 45 minutes to drive to the nearest bowling alley taking city streets going 30 miles per hour
zmey [24]

Answer:

The time it will take to get to the bowling alley while driving at 65 mph on the freeway is approximately 20.8 minutes

Step-by-step explanation:

The given parameters are;

The time it takes through the streets to drive to the nearest bowling alley = 45 minutes

The speed of driving through the streets = 30 miles per hour (mph)

The speed of driving through the freeway to the bowling alley = 65 mph

From the speed of driving through the streets and the time taken we have;

The formula for speed, S, is S = Distance/Time

Therefore, 30 mph = Distance/45 minutes

Where, 1 hour = 60 minutes, 45 minutes = 1/60×45 hour = 3/4 hour

30 mph = Distance/45 minutes = Distance/(3/4 hour)

30 mph = Distance/(3/4 hour)

Distance = 30 mph × 3/4 hour = 22.5 miles

Given that the distance through the freeway and through the streets are the same, we have from speed = Distance/Time;

Time = Distance/Speed

The speed through the freeway = 65 mph while the distance remain 22.5 miles

Therefore;

Time = 22.5 miles/(65 mph) ≈ 0.346 hour ≈ 20.8 minutes

The time it will take to get to the bowling alley while driving at 65 mph on the freeway is approximately 20.8 minutes.

8 0
3 years ago
What are prime and composite numbers
alexgriva [62]

Answer:

A prime number is a number ( greater than 1) and it cannot be found/formed by multiplying two smaller numbers.

A composite number is a positive number/integer that can be found/formed by multiplying two smaller numbers/integers.

Hope this helps! Have a great day/night! :)

8 0
3 years ago
The area of this rectangle is 30 m^2 . which is the perimeter of the rectangle ?
irga5000 [103]

Answer:

D. 26 m

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
HELPPPPP MEEEE PLZZZ
olga55 [171]

Answer:

D

Step-by-step explanation:

if a<b,then b<a is the answer

7 0
3 years ago
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