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givi [52]
3 years ago
8

Simplify 8 2(10 – r). a. 7r – 18 b. –2r – 18 c. –2r – 9 d. 28 – 2r

Mathematics
1 answer:
fiasKO [112]3 years ago
8 0
8 + 2(10 - r) = 8 + 20 - 2r = 28 - 2r
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Solve each system by elimination. 3x - 2y = 1 2x + 2 y = 14
Paha777 [63]
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3x-2y=14
12x+2y=14
15x=28
Divide both sides by 15
X=28/15
3x 28/15 -2y=14
Y=-21/5
(X,y)=28/15, -21/5
3x 28/15 -2x(-21/5)=12x 28/15 +2x(-21/5)=14
14=14=14
(x, y)=(28/15, -21/5) is the answer
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3 years ago
1. An AP Statistics class starts a project to estimate the average number of hours a student at their high school sleeps per nig
Aleks [24]

Answer:

(C) Sample: the 120 students surveyed. Population: the 1200 students at the high school. Parameter of interest: the average number of hours a student at this high school sleeps per night.

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6 0
3 years ago
Write an expression describing all the angles that are coterminal with 141°.
MA_775_DIABLO [31]
<span>The coterminal angles of angle A are given by adding k times 360° to it, where k is an integer, positive or negative. Similarly, all angles that are coterminal with 141° are given by 141° + k * 360° where k is a positive or negative integer. That is 141° + 360°, 141 + 2*360° , 141+3*360° and so on and 141° - 360°, 141° -2*360°, 141° - 3*360° and so on. 9720)</span>
7 0
3 years ago
How do I find Mean Absolute deviation again? I forgot. URGENT!
Luba_88 [7]

Answer:

To find the mean absolute deviation of the data, start by finding the mean of the data set. Find the sum of the data values, and divide the sum by the number of data values. Find the absolute value of the difference between each data value and the mean

Step-by-step explanation:

4 0
2 years ago
Factorise 49x^2-121 what’s the answer
asambeis [7]

Answer:

( 7x + 11  )( 7x-  11 )

Step-by-step explanation:

( 7x + 11  )( 7x-  11 )

Because 7*7 is 49

-11*11= -121

7*11=77

-7*11= -77

77-77=0

so the answer is 49x^2-121

8 0
3 years ago
Read 2 more answers
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