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JulijaS [17]
3 years ago
14

Solve the system using elimination. x − 4y = 4 3x − 4y = −12

Mathematics
1 answer:
Nonamiya [84]3 years ago
3 0
Common in both: -4y
Subtract the second from the first.
x-4y=4
3x-4y=-12
-2x=16
x=-8
Substitute in to find y.
-8-4y=4
-4y=12
y=-3
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marin [14]
(8/13+4/13)+(-6+8) < first one
(8/13+4/13)+(-6+8) and then you add the terms
5 0
3 years ago
Read 2 more answers
Determine the surface area of a rectangular prism with the following dimensions:
atroni [7]

Answer:

b. 106 sq.cm

Step-by-step explanation:

A=L×W

A1= 2(5×8) = 2(40) = 80

A2= 2(1×8) = 2(8) = 16

A3= 2(5×1) = 2(5) = 10

Total area = 80 + 16 +10 = 106 sq. cm

6 0
3 years ago
The number of calories burned at the gym is normally distributed with a mean of 425 and a standard deviation of 51. Find the Z-s
Galina-37 [17]

Answer:

(a) -3.708

(b) 1.706

(c) 0.490

Step-by-step explanation:

The z-score of normal distribution is given as:

z=\frac{x-\mu}{\sigma}

(a)

Given:

Score is, x=268

Mean value is, \mu =425

Standard deviation is, \sigma = 51

z-score is, z=\frac{268-425}{51}=\frac{-157}{51}=-3.078

(b)

Given:

Score is, x=512

Mean value is, \mu =425

Standard deviation is, \sigma = 51

z-score is, z=\frac{512-425}{51}=\frac{87}{51}=1.706

(c)

Given:

Score is, x=450

Mean value is, \mu =425

Standard deviation is, \sigma = 51

z-score is, z=\frac{450-425}{51}=\frac{25}{51}=0.490

6 0
3 years ago
Which terms of the AP: 213, 207, 201… is its last positive term?
riadik2000 [5.3K]

Answer: the last pos term is 3

Details:

213

207

201

195

189

183

177

171

165

159

153

147

141

135

129

123

117

111

105

99

93

87

81

75

69

63

57

51

45

39

33

27

21

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9

3

-3


5 0
4 years ago
1) x+3 - 5x + 7 + 4y​
Colt1911 [192]
Answer:

~ -4x+4y+10

Explanation:

~ We have to collect like terms such as all the x’s, y and the normal numbers.

~ Then add like terms together: x-5x, 4y plus nothing, 3+7

~ After adding them, you should get -4x+4y+10.
5 0
3 years ago
Read 2 more answers
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