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Serga [27]
3 years ago
8

Whoever helps gets brainliest answer and 10 points :)

Mathematics
1 answer:
andrew11 [14]3 years ago
6 0
I think 5?
These are the ages,

12, 12, 14, 15, 17,
28, 29,
40, 41, 44, 45,
50,
69

Only the people on the first row are under 19 and there are 5 people.
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If the area of a circle is 121pie square units, what is the diameter
velikii [3]
Since you are given the area, we can solve for radius with this equation:
A_c = \pi r^2
r = \sqrt{ \frac{A_c}{ \pi } } = \sqrt{ \frac{121 \pi }{ \pi } } = \sqrt{121} = 11

The radius is 11, so the diameter must be 2 times that, which is 22. With the correct units, the answer is 22 units²
4 0
3 years ago
Question 4 (4 points
aalyn [17]

Answer:

It is True 200% legit!

Step-by-step explanation:

4 0
3 years ago
Which completely describes the polygon?
bogdanovich [222]

option D none of the above

4 0
3 years ago
How many and what type of solutions does the equation have?
Natali [406]
Let's solve the equation 2k^2 = 9 + 3k
First, subtract each side by (9+3k) to get 0 on the right side of the equation
2k^2 = 9 + 3k
2k^2 - (9+3k) = 9+3k - (9+3k)
2k^2 - 9 - 3k = 9 + 3k - 9 - 3k
2k^2 - 3k - 9 = 0

As you see, we got a quadratic equation of general form ax^2 + bx + c, in which a = 2, b= -3, and c = -9.
Δ = b^2 - 4ac
Δ = (-3)^2 - 4 (2)(-9)
Δ<u /> = 9 + 72
Δ<u /> = 81

Δ<u />>0 so the equation got 2 real solutions:
k = (-b + √Δ)/2a = (-(-3) + √<u />81) / 2*2 = (3+9)/4 = 12/4 = 3
AND
k = (-b -√Δ)/2a = (-(-3) - √<u />81)/2*2 = (3-9)/4 = -6/4 = -3/2

So the solutions to 2k^2 = 9+3k are k=3 and k=-3/2

A rational number is either an integer number, or a decimal number that got a definitive number of digits after the decimal point.

3 is an integer number, so it's rational.
-3/2 = -1.5, and -1.5 got a definitive number of digit after the decimal point, so it's rational.

So 2k^2 = 9 + 3k have two rational solutions (Option B).

Hope this Helps! :)
7 0
3 years ago
Read 2 more answers
What is the probability of rolling a dice and getting either a 1 or 2 and flipping a coin and getting a heads?
EastWind [94]

Answer:

1/3 and 1/2

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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