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noname [10]
3 years ago
11

PLEASE ANSWERRR! FIRST CORRECT ANSWER WILL VOTE BRAINLIEST

Mathematics
1 answer:
FinnZ [79.3K]3 years ago
8 0

Answer:

  • k = 7/4

Step-by-step explanation:

<u>Given system:</u>

  • x + y + 3z = 10,
  • -4x + 3y + 5z = 7,
  • kx + z = 3

<u>Substitute z in the first two equations with z = 3 - kx:</u>

  • x + y + 3(3 - kx) = 10 ⇒ (1 - 3k)x + y = 1 ⇒ y = (3k - 1)x + 1
  • -4x + 3y +5(3 - kx) = 7 ⇒ -(4 + 5k)x + 3y = -8 ⇒ y = 1/3(5k + 4) - 8

In order the two equations above not to have a solution, the lines should be parallel. Parallel lines have equal slopes.

<u>Solve the following equation for k:</u>

  • 3k - 1 = 1/3(5k + 4)
  • 9k - 3 = 5k + 4
  • 4k = 7
  • k = 7/4
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If u(x) = x5 – x4 + x2 and v(x) = –x2, which expression is equivalent to (u/v)(x)
choli [55]

Answer:

c) -x^3 + x^2 - 1

Step-by-step explanation:

Given: u (x) = x^5 - x^4 +x^2 and v(x) = -x^2

(u/v)(x) = u(x)/v(x)

Now plug in the given functions in the above formula, we get

= (x^5 - x^4 + x^2) / -x^2

We can factorize the numerator.

In x^5 - x^4 + x^2. the common factor is x^2, so we can take it out and write the remaining terms in the parenthesis.

= x^2 (x^3 - x^2 + 1) / - x^2

Now we gave x^2 both in the numerator and in the denominator, we can cancel it out.

(u/v)(x) = (x^3 - x^2 + 1) / -1

When we dividing the numerator by -1, we get

(u/v)(x) = -x^3 + x^2 - 1

Answer: c) -x^3 + x^2 - 1

Hope you will understand the concept.

Thank you.

6 0
3 years ago
Read 2 more answers
How do i simplify this problem?<br><br>12r+5s-7T+9s-4r​
Nimfa-mama [501]

Answer: To simplify this problem you combine the like terms in the equation (numbers with the same variables.)

Demo: 12r + -4r = 8r

4 0
4 years ago
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To convert a capacity of 8.7 gallons to quarts, which ratio could you multiply by? remember that 1 gallon = 4 quarts.
Papessa [141]
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3 0
3 years ago
A hot cup of coffee is put outside on a cool day. The temperature of the coffee, C in degrees Celsius, is a function of time, t
MArishka [77]

9514 1404 393

Answer:

  • units for 20: minutes
  • units for 30: degrees Celsius

Step-by-step explanation:

The problem statement tells you the function value is in degrees Celsius, and the function argument is in minutes.

units for 20: minutes

units for 30: degrees Celsius

4 0
3 years ago
Consider a $100 investment earning 12% compounded quarterly. how long will it take to triple your money? round your answer to th
ANTONII [103]
Summarizing the question,
Principle(P)=$100
Rate (r)=12%=0.12
Amount (A)=3×P=$300
Time=t=?
n=no of times the interest is compouned per year=4
Then,
A=P{(1+r/n)}^(n×t)
or,300=100×{1+0.12/4}^(4×t)
or,300/100=(1+0.03)^(4×t)
or,3=1.03^(4×t)
Taking log on both sides,
log3=log[(1.03)^(4×t)]
or,log3= (4×t)×log(1.03)
or,4t=log3/log(1.03)
or,t=log3/[4×log(1.03)]
or, t=9.29175...
t=9.3 years ANS!!!

6 0
3 years ago
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