![fzzyy](/avatars/36559.jpg)
fzzyy
27.11.2019 •
Mathematics
Ineed the answer for 10 and how you got the answers
Solved
Show answers
More tips
- H Health and Medicine Choosing the Right Contraception Method: Your Ultimate Guide...
- C Computers and Internet How to Choose a Monitor?...
- H Horoscopes, Magic, Divination Where Did Tarot Cards Come From?...
- S Style and Beauty How to Make Your Lips Fuller? Ideas and Tips for Beautiful Lips...
- C Computers and Internet How to Learn to Type Fast?...
- A Art and Culture Who Said The Less We Love a Woman, the More She Likes Us ?...
- F Family and Home How to Get Rid of Your Neighbors?...
- S Society and Politics How Could Nobody Know About the Dead Mountaineers?...
- H Health and Medicine How to Cure Adenoids?...
Answers on questions: Mathematics
- M Mathematics Match the situation to the correct expression. the product of 40 and n select the correct answer. a)n+ 40 b)40n c)40/n d)n - 40...
- M Mathematics Atriangle has angles a, b and c. which of the following could not be a set of angles?...
- M Mathematics Assume abc def. if ma = 70 , mb = 47 , and mc = 63 , what is the measure of f? a. 63 b. 70 c. 47 d. cannot be determined...
- M Mathematics In triangle abc, what is the measure of angle ca. 108b. 36c. 18d. 20...
- M Mathematics What is the sum of the polynomials ( image added) a. 10x^2 - 9 b. 11x^2 - x -9 c. 11x^2 + x - 1 d. 12x^2 - 1...
- M Mathematics An 18-foot ladder is leaning against a vertical brick wall. the base of the ladder is 9 feet away from the wall. at what angle does the ladder meet the wall?...
- M Mathematics Ineed with this question (trigonometry)...
- M Mathematics If you spend 3/5 of your $40 gift card, how much money will be left on it?...
- M Mathematics Find the least common denominator for these two rational expressions. a5 -6 a2 + 4a + 4 а? — За – 10 -...
- M Mathematics Help guyssubject maths...........
Ответ:
A.
B. 25% discount
Step-by-step explanation:
PART A:
For the shirt:
Now,![\frac{x}{y} =\frac{24}{18} =\frac{4}{3}](/tpl/images/0392/5285/f51a4.png)
⇒![y=\frac{3}{4}x](/tpl/images/0392/5285/345e9.png)
For the pair of shoes:
Now,![\frac{x}{y} =\frac{56}{42} =\frac{4}{3}](/tpl/images/0392/5285/4e815.png)
⇒![y=\frac{3}{4}x](/tpl/images/0392/5285/345e9.png)
So, the equation that represents the sale price y of an item that costs x dollars is:![y=\frac{3}{4} x](/tpl/images/0392/5285/7ad01.png)
PART B:
y=Sale price of an item
x=Cost of the item
Discount on the item![=x-y=x-\frac{3}{4} x=\frac{x}{4}](/tpl/images/0392/5285/95333.png)
Percentage discount on the item
×100
%
Ответ:
Explanation:
Cut the x coefficient (10) in half to get 10/2 = 5. Then square this to get 5^2 = 25.
We'll add 1 to both sides so that the "24" turns into "25", thereby completing the square
x^2 + 10x + 24 = 0
x^2 + 10x + 24+1 = 0+1
x^2 + 10x + 25 = 1
Notice on the left hand side we have something of the form A^2+2AB+B^2 where A = x and B = 5. We can factor this into (A+B)^2, which is the whole reason why we completed the square. You can use the FOIL rule to see how (A+B)^2 expands out into A^2+2AB+B^2. Factoring reverses this process.
This means x^2+10x+25 factors to (x+5)^2 and we now have these steps
(x+5)^2 = 1
x+5 = sqrt(1) or x+5 = -sqrt(1)
x+5 = 1 or x+5 = -1
x = 1-5 or x = -1-5
x = -4 or x = -6 are the two solutions
Let's check x = -4 to see if it works or not
x^2 + 10x + 24 = 0
(-4)^2 + 10(-4) + 24 = 0
16 - 40 + 24 = 0
-24 + 24 = 0
0 = 0
We get a true equation. That confirms x = -4 is a solution.
If we tried x = -6, then,
x^2 + 10x + 24 = 0
(-6)^2 + 10(-6) + 24 = 0
36 - 60 + 24 = 0
-24 + 24 = 0
0 = 0
That x value is confirmed as well.