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3 years ago

11

A marching band with 75 members makes two rectangular marching formations. One rectangle has 6 rows and the other rectangle had

9 rows.

1 answer:

Ugo [173]3 years ago

6 0

The rectangle with 6 rows has 30 people in the whole rectangle. The rectangle with 9 rows has 45 people.

6 x 5 =30

9 x 5 =45

30+45 =75 people

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The sum of the areas of the two circles is 80 pi square meters. Find the length of a radius of each circle of one of them is twi

nikklg [1K]

The radius of both circles are 4m and 8m.

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3 years ago

Which of the following changes will always be true for an exothermic process?

Ivenika [448]

Given that I no not see any explanation in the previos answer, I think you can benefit of this.

Exothermic refers only to the fact that the reaction releases energy in the form of heat when occurs. So, the enthalpy is higher at start and lower and the end.

Seen in this way, you can deduct that the change in enthalpy is negative, which is what the third option says.

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3 years ago

Read 2 more answers

2x+5y=20. , -2x+20y=-90. one solution. infinity many ir no solution. use elimination to find your answer

scoundrel [369]

2x+5y=20
X=10-2.5y

-2(10-2.5y)+20y=-90
-20+5y+20y=-90
25y=-70
Y=2.8

2(2.8)+5y=20

5.6+5y=20
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Y=2.88

CHECK:
2(2.8)+5(2.88)=20

5 0

3 years ago

What is 36838e÷592019339e

miskamm [114]

Answer:

Hi! Your answer is down below!

Step-by-step explanation:

Hope this helps!

Have a nice day <3

4 0

2 years ago

Read 2 more answers

The length of time for one individual to be served at a cafeteria is a random variable having an exponential distribution with a

Leya [2.2K]

Answer:

a) 0.25

b) 52.76% probability that a person waits for less than 3 minutes

Step-by-step explanation:

Exponential distribution:

The exponential probability distribution, with mean m, is described by the following equation:

$f(x) = \lambda e^{-\lambda x}$

In which $\lambda = \frac{1}{m}$ is the decay parameter.

The probability that x is lower or equal to a is given by:

$P(X \leq x) = \int\limits^a_0 {f(x)} \, dx$

Which has the following solution:

$P(X \leq x) = 1 - e^{-\mu x}$

The probability of finding a value higher than x is:

$P(X > x) = 1 - P(X \leq x) = 1 - (1 - e^{-\mu x}) = e^{-\mu x}$

In this question:

$m = 4$

a. Find the value of λ.

$\lambda = \frac{1}{m} = \frac{1}{4} = 0.25$

b. What is the probability that a person waits for less than 3 minutes?

$P(X \leq 3) = 1 - e^{-0.25*3} = 0.5276$

52.76% probability that a person waits for less than 3 minutes

3 0

3 years ago