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ss7ja [257]
3 years ago
10

Please I really need help 100 points

Mathematics
2 answers:
Amiraneli [1.4K]3 years ago
5 0

Answer:

<h2>x = 3 and y = -1 ⇒ (3, -1)</h2>

Step-by-step explanation:

\left\{\begin{array}{ccc}2x-3y=9&\text{multiply both sides by 5}\\3x+5y=4&\text{multiply both sides by 3}\end{array}\right\\\\\underline{+\left\{\begin{array}{ccc}10x-15y=45\\9x+15y=12\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad19x=57\qquad\text{divide both sides by 19}\\.\qquad x=3\\\\\text{Put the value of x to the second equation:}\\\\3(3)+5y=4\\9+5y=4\qquad\text{subtract 9 from both sides}\\5y=-5\qquad\text{divide both sides by 5}\\y=-1

Afina-wow [57]3 years ago
4 0

Multiply the first equation by 3 and the second equation by 2:

\begin{cases}6x-9y=27\\6x+10y=8\end{cases}

Subtract the two equation to get rid of the x variable:

-9y-10y=27-8 \iff -19y = 19 \iff y = -1

Use the value of y to determine the value of x: for example, using the first equation we have

2x+3=9 \iff 2x=6 \iff x=3

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Loni has read 25% of a book if she has been reading for 5 hours, how many more hours will it take her to complete the book
Ivahew [28]

Answer: It will take her 15 more hours to finish the book.

Step-by-step explanation:

25% : 5h

50% : 10h

75% : 15h

100% : 20h

It would take 20 hours to complete the book, but because she already read for 5 hours, it would be 15 to finish the book.

4 0
3 years ago
Read 2 more answers
Find the volume of the triangular prism below.
brilliants [131]

Answer:

b.168

Step-by-step explanation:

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3 years ago
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Aloiza [94]

Answer:

12.48

Step-by-step explanation:

12*1.04=12.48

3 0
3 years ago
The price p, in dollars, of a specific ca that is x year old is modeled by the function p(x)=22,255(0.91)^x
uysha [10]

Answer:

Step-by-step explanation:

Answer:

Step-by-step explanation:

The price p, in dollars, of a specific car that is x year old is modeled by the function p(x)=22,255(0.91)^x

a) to determine the cost of a 2 year old car, we will substitute 2 for x in the given function. Therefore

p(2)=22,255(0.91)^2

p(2)=22,255 × 0.8281 = $18673.655

Approximately $18674

b) to determine the cost of a 7 year old car, we will substitute 7 for x in the given function. Therefore

p(7)=22,255(0.91)^7

p(2)=22,255 × 0.51676101936 = 11500.51648579693

Approximately $11501

c) 0.91 indicates exponential decay rate. It is a fixed percentage by which the value of the car decreases every year. It is determined by (1 - rate of decay)

7 0
3 years ago
How many arrangements of three letter can be formed from the letters of the word MATH if anyletter will not be used more than on
Mariulka [41]

Combinations = n! / (n - r)! r!

C\text{ = }\frac{n!}{(n-r)!\text{ r!}}\text{ }

In this case:

n = 4

r = 3

Combinations = 4! /(4-3)! 3! = 24/(1)(6) = 24/6 = 4

Answer:

4 arrangements

7 0
1 year ago
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