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3 years ago

The ratio of boys to girls in history class is 4to5 how many girls are in class if there are 12 boys in the class

Mathematics

2 answers:

bonufazy [111]3 years ago

8 0

15 girls in the class

DENIUS [597]3 years ago

6 0

The answer is 15 girls

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If the probability of a student taking a calculus class is 0.10, the probability of taking a statistics class is 0.90, and the p

Stells [14]

Answer:

93% probability of a student taking a calculus class or a statistics class

Step-by-step explanation:

We solve this problem building the Venn's diagram of these probabilities.

I am going to say that:

A is the probability that a student takes a calculus class.

B is the probability that a student takes a statistics class.

We have that:

$A = a + (A \cap B)$

In which a is the probability that a student takes calculus but not statistics and $A \cap B$ is the probability that a student takes both these classes.

By the same logic, we have that:

$B = b + (A \cap B)$

The probability of taking a calculus class and a statistics class is 0.07

This means that $A \cap B = 0.07$

The probability of taking a statistics class is 0.90

This means that $B = 0.9$ . So

$B = b + (A \cap B)$

$0.9 = b + 0.07$

$b = 0.83$

The probability of a student taking a calculus class is 0.10

This means that $A = 0.1$

$A = a + (A \cap B)$

$0.1 = a + 0.07$

$a = 0.03$

What is the probability of a student taking a calculus class or a statistics class

$A \cup B = a + b + A \cap B = 0.03 + 0.83 + 0.07 = 0.93$

93% probability of a student taking a calculus class or a statistics class

5 0

3 years ago

What is the overall charge for neon,oxide, copper, and tin ?

Finger [1]

Answer:

Neon is stable, hence has no charge.

Oxide (O2-) has a charge of -2

Cooper (Cu2+) has a charge of +2

Tin (Sn2+) has a charge of +2

hence overall charge = -2+2+2

Overall charge = +2

6 0

2 years ago

Solve easy equation (for points) 8+x+15=20

Andru [333]

Answer:

x= -3

Step-by-step explanation:

You're Welcome :)

7 0

3 years ago

Hannah says that 2.11 is a rational number. Gus says that 2.11 is a repeating decimal. Who is correct and why?

shusha [124]

Answer

2.11 is rational number Hannah is correct because it doesn't have 3 dots in the end if it is repeating decimal it will be (2.11.......

7 0

3 years ago

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Irina has 6 tubs of yogurt she wants to scoop it all into bowls each bowl holds 1/4 tub of yogurt which division equation can be

elena55 [62]

In order to find the answer, you can use-

1/4x=6

In order to get the answer, you multiply 6 by the denominator.

6x4=24

Then, you'd divide the solution of that part by the numerator.

24 divided by 1 equals 24.

Therefore, the final answer would be 24.

7 0

3 years ago

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