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Alja [10]
3 years ago
15

Which of the following sets shows all the numbers from the set {1, 2.5, 3, 4.5, 5} that make the inequality 3a + 4 ≥ 13 true?

Mathematics
2 answers:
zmey [24]3 years ago
3 0
3(1)+4<span>≥ 13
7</span><span>≥ 13 
No

3(2.5)+4</span><span>≥ 13
11.5</span><span>≥ 13
No

3(3)+4</span><span>≥ 13
13</span><span>≥ 13
Yes

{3, 4.5, 5}</span>
Slav-nsk [51]3 years ago
3 0

Answer:

[3, 4.5, 5] :D

Step-by-step explanation:

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A trumpet has a length of 140cm. The first valve lowers the root note by two semitones (f1/f0 = 2-2/12) and the second valve low
Alexxandr [17]

Answer:

a.  17.145cm

b. 8.325cm

c. 0.846

d. 2.896

Step-by-step explanation:

It is known that frequency is inversely proportional to length.

Case 1: The player presses only the first valve.

f₁/fo = 2^{-2/12} = lo/l₁

given that lo= 140cm.

l₁ = 2^{2/12}lo = 157.145

change in length:

l₁ - lo = 157.145 - 140 = 17.145cm

Case 2: The player presses only the second valve.

f₂/fo = 2^{-1/12} = lo/l₂

l₂ = 2^{1/12}lo = 148.325cm

l₂  - lo= 148.325-140 = 8.325cm

Case 3: The player presses both the first and second valve.

Change in length is the sum of change in length when they are individually pressed.

l₃ - lo = 17.145+8.325 = 25.47cm

l₃ = 25.47cm+lo = 165.47cm

f₃/fo  = 2^{-n/12} = lo/l₃

f₃/fo = 2^{-n/12} = 140/{165.47 = 0.846

2^{-n/12} = 0.846\Rightarrow n/12 = -log(0.846)/log(2) = 0.2413

n = 0.2413*12 = 2.896

5 0
3 years ago
How many times larger is the value 4.74 than the value 0.047 for
Dimas [21]
Its 200 /0.5<span> = 400 times </span>
5 0
3 years ago
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If in one year a city recorded a total of 97 rainy, how many of the days did it not rain?
Shalnov [3]

1 year = 365 days

365 -97 = 268

it did not rain 268 days

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3 years ago
Let X be the number of successes in six independent trials of a binomial experiment in which the probability of success is
Helen [10]

Answer:

b

Step-by-step explanation:

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2 years ago
Solve the equation for the given variable. *<br> 3(x - 5) = 7
MariettaO [177]

Answer:

x = 7.33

Step-by-step explanation:

3x - 15 = 7

3x = 7 + 15

3x = 22

x = 7.33

4 0
3 years ago
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