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3 years ago

Simplify 5+4x(8-6)^2

2 answers:

8 0

Ok Use PEMDAS Since 8 and 6 is in pharenthesis you do that first which equals 5+4x2^2 Then you do Exponents which is 2^2 that equals 4 so that means you have 5+4x4 No you multiply 4x4 which equals 16 And now add 5 That will make 21

Vikki [24]3 years ago

3 0

Help me first and then ill help you

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The area of a circle is 43.25cm2. Find the length of the radius rounded to 2 DP.

Monica [59]

Answer:

3.71 cm

Step-by-step explanation:

Hi there!

Area of a circle equation: $A=\pi r^2$ where r is the radius

Plug in the area 43.25 cm²

$43.25=\pi r^2$

Divide both sides by π to isolate r²

$\frac{43.25}{\pi} =\frac{\pi r^2}{\pi} \\\frac{43.25}{\pi}=r^2$

Take the square root of both sides to isolate r

$\sqrt{\frac{43.25}{\pi}} =r\\3.71=r$

Therefore, the length of the radius rounded to 2 decimal points is 3.71 cm.

I hope this helps!

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3 years ago

Erin received the following scores on her last four spelling tests.

Tatiana [17]

The second one, 82% is Erin's highest score

4 0

3 years ago

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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

Anybody? need help asap

VladimirAG [237]

Answer:

K=2h

k=0.5h

k=h + 1

k= 0.5h + 10

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3 years ago

A car travels 41 km in 31 minutes.

My name is Ann [436]

Answer: 1.30 every km

Step-by-step explanation:

to find the speed per km, you do 41 divided by 31.

41/31= 1.30 per km (rounded)

5 0

4 years ago

Read 2 more answers