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fenix001 [56]
3 years ago
12

If 3x + 4y = 10 and 2x + 3y = 6, then x + y = ?

Mathematics
1 answer:
zavuch27 [327]3 years ago
5 0

Answer:

x + y = 4

Step-by-step explanation:

Given the 2 equations

3x + 4y = 10 → (1)

2x + 3y = 6 → (2)

Subtract (2) from (1) term by term on both sides

x + y = 4

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An election ballot asks voters to se4five city commissioners from a group of fifteen candidates. In how many wsys can this be do
svp [43]

That's "15 choose 5"

\displaystyle{15 \choose 5} = \dfrac{15! }{5! 10!} = \dfrac{15 \cdot 14 \cdot 13 \cdot 12 \cdot 11}{5 \cdot 4 \cdot 3 \cdot 2 \cdot 1} = (15/(5(3))(14/2)(13)(12/4)(11)\\\\= 7(13)(3)(11)=231(13)=3003

Answer: 3003 ways

8 0
3 years ago
Larry is 10 years old and his sister is 7 years old. In how many years time will there total age be 25 years?
maks197457 [2]
In the next 25 years, Larry will be 35 years old, while his sister will be 3 years less than him which is 32 years old for his sister, since his sister is 3 years younger.
7 0
3 years ago
Read 2 more answers
Show all work to factor x4 - 5x2 + 4 completely.
otez555 [7]
The answer is 2(2x-3)

Explanation: First you multiple 5 and 2 getting you ten
4x-10+4

Then you add -10 and 4 to get -6
4x-6

Finally you factor out the number to and divide both the 4 and -6
2(2x-3)
7 0
3 years ago
Carbon-14 tests are often performed to determine the age of an organism that died a long time ago. Carbon-14 has a half-life of
Crank

Answer:

2006 years old.

Step-by-step explanation:

If it had 50% of its carbon-14 it would be 5730 years old.

Since it has 65% left it is younger than 5730 years.

So it is (1 - 0.65) * 5730

= 2005.5 years old.

7 0
2 years ago
Which statement is true?
Nataliya [291]

Answer:

D

Step-by-step explanation:

We can see in the graph f(x) that the x intercept is (1,0).

In the table of g(x), we can see that the x intercept is (-1,0).

Since 1>-1, the x intercept of the graph f(x) is greater than the x intercept of graph g(x).

7 0
2 years ago
Read 2 more answers
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