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inna [77]
3 years ago
7

In a 20% off sale, a gizmo costs £800. What was the original cost? Please add how you work it out.

Mathematics
1 answer:
den301095 [7]3 years ago
4 0
This is the answer for your question
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Given that f(x)= x^3/4 +6<br> a) Find f(4)<br> b) Find f^-1(x)<br> c) Find f^-1(8)
Anna35 [415]

a)

f(4)=\dfrac{4^3}{4}+6=4^2+6=16+6=22

b)

\begin{aligned}\\&y=\dfrac{x^3}{4}+6\\&4y=x^3+24\\&x^3=4y-24\\&x=\sqrt[3]{4y-24}\\&f^{-1}(x)=\sqrt[3]{4x-24}\end

c)

f^{-1}(8)=\sqrt[3]{4\cdot8-24}=\sqrt[3]{8}=2

7 0
2 years ago
Read 2 more answers
On Tuesday at lunchtime, it was 29 degrees Celsius. By sunset, the temperature had dropped to 16 degrees Celsius. Please write a
ss7ja [257]

Answer:

Expression is; 29 - x = 16

I've attached an image showing the number line

Step-by-step explanation:

We are told that at lunchtime, it was 29 degrees Celsius and that by sunset, the temperature had dropped to 16 degrees Celsius.

Let the drop be x.

Thus;

29 - x = 16

I've attached an image showing the number line

6 0
3 years ago
What is the domain of the function y= 4x+6 - 7?
Fantom [35]
<h2>Answer:</h2>

<em>Domain:</em>  (−∞,∞)  ,  {x|x∈R}

<h2> explanation:</h2>

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

<u><em>Interval Notation:</em></u>

(−∞,∞)

<u><em>Set-Builder Notation:</em></u>

{x|x∈R}

i hope this helped. please give brainliest if it did!

4 0
3 years ago
Lupita rides a taxi that charges a flat rate of $6.75 plus $3.20 per mile. If the taxi charges Lupita $40.03 in total for her tr
Alex777 [14]
Hello! In order to understand this question, we need to take a look at the content that is involved.

Lupita pays $40.03 in total. Meaning that's where we are going to start if we want to find out how many miles her ride was. Since the taxi charges a flat rate of $6.75. We would want to subtract it from her total value because we only work with that flat rate once. Which ends up giving us $33.28. From there, we don't need to worry about the flat rate anymore and we now focus on the mileage. If it costs $3.20 per mile, then we can simply divide the amount after to flat rate by the cost per mile, to figure out how many miles she has gone. In the end, you will get 10.4 miles.
8 0
3 years ago
An international data plan charges $10.00
Elza [17]

Answer:

y = 2.50x + 10

Step-by-step explanation:

7 0
4 years ago
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