2 years ago

The ratio of boys to girls in a school is 4:5. How many boys are in the school if there are 720 students.

1 answer:

7 0

Answer: 320 boys

Step-by-step explanation: you would first take the total number (720) and divide it by the total number shown in the ratio (5+4=9)

720/9= 80

You would then take 80 and multiply it by 4 because that is the number representing the boys

80*4= 320

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Suppose P(E) = 81%; P(E and F) = 9%; and P(E or F) = 65%,

PIT_PIT [208]

Using Venn probabilities, it is found that P(F) = -0.07, which is not a probability, as it is a negative value.

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We have two events, E and F.
Their probabilities are: $P(E) = 0.81, P(E \cap F) = 0.09, P(E \cup F) = 0.65$
The probabilities are related by the following equation:

$P(E \cap F) = P(E) + P(F) - P(E \cup F)$

Replacing into the equation, we can find P(F).

$0.09 = 0.81 + P(F) - 0.65$

$0.16 + P(F) = 0.09$

$P(F) = -0.07$

P(F) = -0.07, which is not a probability, as it is a negative value.

A similar problem is given at brainly.com/question/21421475

4 0

2 years ago

Which expressions represent a difference of squares?

andrew-mc [135]

Answer:

$25 {x}^{2} - 36\\ 1-16x^2\\4x^2 - 12x + 9$

Step-by-step explanation:

$25 {x}^{2} - 36 \\ = ( {5x})^{2} - ( {6})^{2} \\$

4 0

3 years ago

Of the 200 packages of bagels sold, 15 of them are sesame seed bagels. What percent of the bagel packages sold are Sesame Seed?

yawa3891 [41]

The answer is 30 lol, if you do the ratio you should get the same answer

8 0

3 years ago

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Helpppppppppp WILL MARK BRAINLIST

JulsSmile [24]

Answer:

Y = 6

X = 10

Step-by-step explanation:

6 0

3 years ago

The measure of an angle is 32.9°. What is the measure of its complementary angle?

zubka84 [21]

Answer: 57.1

Step-by-step explanation: To be complementary the angles have to add up to make a sum of 90.

90 - 32.9 = 57.1

The angles are 32.9 and 57.1.

8 0

2 years ago