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4 years ago

What is the answers to 1-4 and how do I get them?

Mathematics

1 answer:

alex41 [277]4 years ago

7 0

The area of a circle is equal to Pi x Radius squared. Or Pi (the symbol) r (then to the second power.) The radius is half of the entire circle (the diameter.)

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Convert 20 miles in km

Tamiku [17]

Answer:

32.1869

Step-by-step explanation:

Formula :

for an approximate result, multiply the length value by 1.609

help me by marking as brainliest....

4 0

2 years ago

The mean life of a particular brand of light bulb is 1200 hours. If you know that at about 95% of this brand of bulbs will last

Pachacha [2.7K]

Answer:

c) 50

Step-by-step explanation:

We have been given that the mean life of a particular brand of light bulb is 1200 hours. About 95% of this brand of bulbs will last between 1100 and 1300 hours.

We will use z-score formula to solve our given problem.

$z=\frac{x-\mu}{\sigma}$ , where,

$z=\text{z-score}$ ,

$x=\text{Sample score}$ ,

$\mu=\text{Mean}$ ,

$\sigma=\text{Standard deviation}$

We know that 95% of data points lies within two standard deviation of mean, so 1100 will correspond to a z-score of -2 and 1300 will correspond to a z-score of 2.

$-2=\frac{1000-1200}{\sigma}$

$-2=\frac{-100}{\sigma}$

$\sigma=\frac{-100}{-2}$

$\sigma=50$

We can use sample score 1300 and get same answer as:

$2=\frac{1300-1200}{\sigma}$

$2=\frac{100}{\sigma}$

$\sigma=\frac{100}{2}$

$\sigma=50$

Therefore, the standard deviation of the light bulbs’ life is 50 years.

4 0

4 years ago

What is the measure of ACE in the diagram below? A. 46 B. 104 C. 29 D. 58

beks73 [17]

Answer:

Step-by-step explanation:

The secant- secant angle ACE is half the difference of the measures of the intercepted arcs, that is

∠ ACE = $\frac{1}{2}$ (AE - BD ) = $\frac{1}{2}$ (104 - 46)° = $\frac{1}{2}$ × 58° = 29° → C

3 0

4 years ago

Read 2 more answers

What is greater. 3/5 or 1/4

choli [55]

Answer:

1/4 is greater than 3/5.

4 0

4 years ago

Read 2 more answers

Y=2x/a+2b solve for a

mina [271]

Solve for a.

y=2x/a+2b

Multiply both sides by a.

ay=2ab+2x

Add -2ab to both sides.

ay+−2ab=2ab+2x+−2ab

−2ab+ay=2x

Factor out variable a.

a(−2b+y)=2x

Divide both sides by -2b+y.

a(−2b+y) / −2b+y = 2x / −2b+y

a = 2x / −2b+y

6 0

3 years ago