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vladimir2022 [97]
4 years ago
13

Using the substitution method, answer the question. y=4x-3 y=-x+7

Mathematics
1 answer:
Nutka1998 [239]4 years ago
7 0
Basically they're both equal
4x-3=x+7
-x. -x
3x-3=7
+3 +3
3x=10

X=10/3
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How do i find a vertex of a parabola
DanielleElmas [232]

Answer:

The standard form of a parabola is

y=ax2+ +bx+c, where a≠0.

To find the vertex, you need to find the x- and y-coordinates.

7 0
3 years ago
In a packet of 40 Skittles, 12 are red. What percentage of the Skittles are red?​
Viktor [21]

Answer:

12/40×100= 30%

Step-by-step explanation:

12/40×100 = 12/2×5 =6×5= 30%

6 0
3 years ago
-4j-1-5j+6= pls help me
alukav5142 [94]

Answer:

-9j+5

combine like terms to get this answer

7 0
3 years ago
Read 2 more answers
The school production of​ 'Our Town' was a big success. For opening​ night, 391 tickets were sold. Students paid ​$4.00 ​each, w
drek231 [11]

Answer:

280 students

111 non students

Step-by-step explanation:

number of students (S)

number of non students (N)

S+N=391     S=391-N

4S+6N=1786

substitute S

4(391-N)+6N=1786

1564-4N+6N=1786

subtract 1564 from each side

2N=222

N=111

S=391-111=280

3 0
3 years ago
b. Find a 99% confidence interval for mean age of ICU patients using the facts that, in the sample, the mean is 57.55 years and
rjkz [21]

Answer:

<em>99% of confidence intervals for mean age of ICU patients</em>

<em>(53.8920 , 61.2079)</em>

Step-by-step explanation:

<u><em>Explanation</em></u>:-

<em>Given sample mean </em>x^{-} = 57.55<em></em>

Given standard error is determined by

                                                             S.E =\frac{S.D}{\sqrt{n} }

<em>Given data standard error = 1.42</em>

<em>99% of confidence intervals for mean is determined by</em>

(x^{-} - Z_{0.01} \frac{S.D}{\sqrt{n} } , x^{-} + Z_{0.01} \frac{S.D}{\sqrt{n} } )

Z_{\frac{\alpha }{2} } = Z_{\frac{0.01}{2} } = Z_{0.05} = 2.576

(x^{-} - 2.576 S.E , x^{-} + 2.576 S.E)

(57.55 - 2.576X 1.42 , 57.55+ 2.576 X1.42)

(53.8920 , 61.2079)

<u><em>Conclusion</em></u>:-

<em>99% of confidence intervals for mean is determined by</em>

<em>(53.8920 , 61.2079)</em>

5 0
3 years ago
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