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olga_2 [115]
3 years ago
9

*11. Find the value of the expression (-1)+2+(-3) + 4 + ... + (-99) + 100. Solution

Mathematics
2 answers:
scZoUnD [109]3 years ago
8 0

Answer:

50.

Step-by-step explanation:

Each pair of numbers add up to 1:

-1 + 2 =  1,  -3 + 4 = 1   and so on

There are 50 of theses pairs so the value is 50.

zhannawk [14.2K]3 years ago
4 0
  • Answer:

<em>50</em>

  • Step-by-step explanation:

<em>(-1) + 2 + (-3) + 4 + ... + (-99) + 100 =</em>

<em>= 2 - 1 + 4 - 3 + .. + 100 - 99</em>

<em>= 1 + 1 + .. + 1 </em>

<em>= 50×1</em>

<em>= 50</em>

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Farmer Rew started with 92 quects on his farm. Every month, he
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Answer:

y = 5x + 92

y = 9x + 27

Step-by-step explanation:

Slope intercept form is written as y = mx + b, and you know that y represents "quects" and x represents months.

For farmer Rew, b would be 92 because that is how many "quects" he started off with. m would be 5 because that is how many new "quects" he gets every month. (y = 5x + 92)

For farmer Joogh, b would be 27 because she started off with 27 "quects." m would be 9 because she gets 9 new "quects" every month. (y = 9x + 27)

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3 years ago
Suppose the U. S. president wants an estimate of the proportion of the population who support his current policy toward revision
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3 years ago
3. Use Structure Ana drew a plan for a
shtirl [24]

Answer:

(5.5, -3.5)

Step-by-step explanation:

As you can see in the figure, the fourth vertex is (5.5, -3.5)

If you observe carefully the vertex given, you will see that there are two vertex with same coordinates in x axis:

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  • (-1.2, 4.4),

And one vertex has other coordinate in x axis, it is: (5.5, 4.4)

To form a rectangle, you need a fourth vertex that will have same coordinate in x than (5.5, 4.4) and same coordinate in y axis as (-1.2, -3.5),

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What is the median of the first half of the data? (first quartile)
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4 years ago
Angle α is in quadrant III, and angle β is in quadrant II. If sin α = –4∕5 and sin β = 1∕2, find cos (α + β).
Minchanka [31]

Answer:

<h2>cos (α + β) = 0.9196</h2>

Step-by-step explanation:

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To get α from sin α = –4∕5,

α = arcsin(-4/5)

α = arcsin (-0.8)

α = -53.13°

If angle α is in quadrant III, then α = 180+53.13 = 233.13° (sin is negative in the 3rd quadrant)

Similarly for sin β = 1∕2

β = arcsin(1/2)

β = arcsin(0.5)

β = 30°

Since  β is in quadrant II,  β = 180-30 = 150°

To find  cos (α + β). where α = 233.13° and  β = 30°

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= cos 383.13°

cos (α + β) = 0.9196

5 0
3 years ago
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