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7nadin3 [17]
2 years ago
10

The ratio of math teachers to choir teachers is 3:2 respectively. There are 12 math teachers. How many math and choir teachers a

re there all together?
Mathematics
2 answers:
marysya [2.9K]2 years ago
8 0

Answer:

30

Step-by-step explanation:

3 + 2 = 5 \\  \frac{2}{5}  \times x = 12 \\   \\  \frac{2x}{5}   = 12 \\ cross \: mutiply \\ 2x = 60 \\ divde \:both \: sides \: by \: 2 \\ x = 30

IrinaK [193]2 years ago
8 0

Answer:

30

Step-by-step explanation:

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Lisa [10]
The formula of the volume of a cylinder:

V=\pi r^2H\\\\where:\\\\r-a\ radius\\H-a\ height\\\pi r^2-an\ area\ of\ base

We have:

V=900\ liters\\1L=1dm^3\ therefore\ V=900L=900dm^3

and

H=20\ dm

substitute:

\pi r^2\cdot20=900\ \ \ |:20\\\\\pi r^2=45\ dm^2

Answer: The area of a base of the cylinder is equal 45 dm².
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3 years ago
A national study, that revealed a normal distribution, revealed that the average time a student spends studying statistics on a
Neporo4naja [7]

Answer:

Null hypothesis = H0 : μ = 60

Alternative hypothesis = H1 : μ < 60

Step-by-step explanation:

From the question given :

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s = 20.4 minutes

The alternative hypothesis is the claim ; which is to hypothesize that the average studying time is 44.27 (which is less than the population average studying time)

The null hypothesis is the initial truth and it is the opposite of the alternative hypothesis.

The hypothesis are :

H0 : μ = 60

H1 : μ < 60

5 0
3 years ago
The diameter of a soccer ball is 8.91 inches. What is the volume of the ball?
Sever21 [200]

Answer:

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Step-by-step explanation:

4 0
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Choose the kind(s) of symmetry. (Select all that apply.)
LenaWriter [7]

Answer:

The kinds of symmetry the letter H has Point , Line and plane symmetry

Explanation:

Point symmetry states that when every part has a matching part:

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Line of symmetry states that it creates two congruent figures that are mirror images of each other

Plane symmetry states a crystal that divides the crystal into two parts that are mirror images of each other.

Given letter H has line of symmetry because the letter folded in half in any way with the parts matching up.

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3 years ago
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Answer:

9 by -2

Step-by-step explanation:

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