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Lubov Fominskaja [6]
3 years ago
8

PLEASE HELP ME 12 POINTS

Mathematics
1 answer:
m_a_m_a [10]3 years ago
3 0

Answer:

∡A = 48°

∡B = 58°

∡BCA = 74°

Step-by-step explanation:

start by finding m∡BCA; this angle is supplementary with ∡BCD and the pair must add up to 180. therefore, m∡BCA = 74°

all three interior angles of a triangle must add up to 180:

74 + 4y + 3y + 22 = 180

96 + 7y = 180

7y = 84

y = 12

substitute '12' for 'y' in 3y + 22 to get 58

substitute '12' for '4y' to get 48

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Three stamps can be attached to each other in various ways.how many ways might three stamps be attached?
ivanzaharov [21]
Let's call the stamps A, B, and C. They can each be used only once. I assume all 3 must be used in each possible arrangement.
There are two ways to solve this. We can list each possible arrangement of stamps, or we can plug in the numbers to a formula. 
Let's find all possible arrangements first. We can easily start spouting out possible arrangements of the 3 stamps, but to make sure we find them all, let's go in alphabetical order. First, let's look at the arrangements that start with A:
ABC
ACB
There are no other ways to arrange 3 stamps with the first stamp being A. Let's look at the ways to arrange them starting with B:
BAC
BCA
Try finding the arrangements that start with C:
C_ _
C_ _
Or we can try a little formula; y×(y-1)×(y-2)×(y-3)...until the (y-x) = 1 where y=the number of items.
In this case there are 3 stamps, so y=3, and the formula looks like this: 3×(3-1)×(3-2).
Confused? Let me explain why it works.
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8 0
3 years ago
Solve questions 1-10 I just need the answer in (x,y) form
Andre45 [30]

Answer:

1. (1,1)

2.(2,-6)

3.Not sure.

4.No solution

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6. (6,-4)

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10.(2,1)

Step-by-step explanation:

Hope that helps bud!:)

5 0
2 years ago
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kotegsom [21]
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3 0
3 years ago
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andreyandreev [35.5K]

Answer:

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Step-by-step explanation:

x=6 because after 6 weeks

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y=19.62 + 1.52

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4 0
3 years ago
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Bond [772]

This is not possible. Why not? Because the smallest the variance can get is 0.

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