What are the solutions of the following system x2+y2=25 , 2x+y=-5

Mathematics

2 answers:

tia_tia [17]2 years ago

6 0

Y=5-2x
x^2 + (5-2x)^2 = 25

x^2 + 25-20x+4x^2 = 25

x^2 +4x^2-20x+25=25
5x^2 -20x=0

x=0 and y=5

BabaBlast [244]2 years ago

6 0

x^2+y^2=25

2x+y=-5

(0, -5) plug into equation 1 and 2 but you have to find what second ordered pair fills in for x^2+y^2=25 which would be (-4, 3). Reasoning is that-

-4^2=16 and 3^2=9 so 16+9=25

The Correct answer is C (0, -5) and (-4, 3)

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Determine whether the following series converge or diverge

Mars2501 [29]

An alternating series $\sum\limits_n(-1)^na_n$ converges if $|(-1)^na_n|=|a_n|$ is monotonic and $a_n\to0$ as $n\to\infty$ . Here $a_n=\dfrac1{\ln(n+1)}$ .

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5 0

3 years ago

72% and 89% confirm that the mean theses two are scores is 80.5%

german

Answer:

correct. the mean of 72 and 89 is 80?5

Step-by-step explanation:

find the mean to confirm it.

(a+b)/2

72+89= 161

161/2=80.5

3 0