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3 years ago

I need help not sure how to answer this

Mathematics

2 answers:

Alja [10]3 years ago

6 0

Answer33

Step-by-step explanation:

otez555 [7]3 years ago

3 0

Answer:

D. 123

Step-by-step explanation:

If angle BAC is 57, then so is the one opposite to it, angle BCD. So together, they would make 114 degrees (57 +57).

If there are a total of 360 degrees in a rhombus and 114 are taken up, then that means we have 246 degrees left (360 - 114 = 246).

These 246 degrees are equally shard by angles B and D. Therefore, we just have to divide by 2 to get the answer:

246 / 2 = 123. And that's your answer!

Hope this helps! Please rate this answer and mark it as Brainliest! :)

Have an awesome day! :)

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Fudgin [204]

Answer:b

Step-by-step explanation:

4 0

3 years ago

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Marcy is making a hooked circle-shaped rug for her mother. The circumference of the circle-shaped rug is 56.52 inches.

Julli [10]

The answer is C you dived the circumference by 2 and use the formula for the area of a circle which is A = π × r^2

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3 years ago

Sean tossed a coin off a bridge into the stream below. The path of the coin can be represented by the equation h = -16t2 + 72t +

boyakko [2]

Answer:

about 5.613 seconds

Step-by-step explanation:

Using the quadratic formula to find the value of t when h = 0, we have ...

at² +bt +c = 0

t = (-b±√(b²-4ac))/(2a)

t = (-72±√(72² -4(-16)(100)))/(2(-16))

t = (-72±√11584)/-32 = (9±√181)/4

Only the positive value of t is of interest.

The coin will hit the stream after (9+√181)/4 seconds ≈ 5.613 seconds.

4 0

3 years ago

An accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before

zheka24 [161]

Answer:

68.2% of the batteries failed between 17.8 and 20.2 hours.

95.44% of the batteries failed between 16.6 and 21.4 hours.

99.97% of the batteries failed between 15.4 and 22.6 hours.

Step-by-step explanation:

The 68-95-99.7 states that, for a normally distributed sample:

68.26% of the measures are within 1 standard deviation of the sample.

95.44% of the measures are within 2 standard deviations of the sample.

99.97% of the measures are within 3 standard deviations of the sample.

In this problem, we have that:

Mean of 19 hours, standard deviation of 1.2 hours.

About 68.26% of the batteries failed between what two values?

This is within 1 standard deviation of the mean. So 68.2% of the batteries failed between 17.8 and 20.2 hours.

About 95.44% of the batteries failed between what two values?

This is within 2 standard deviations of the mean. So 95.44% of the batteries failed between 16.6 and 21.4 hours.

About 99.97% of the batteries failed between what two values?

This is within 3 standard deviations of the mean. So 99.97% of the batteries failed between 15.4 and 22.6 hours.

5 0

3 years ago

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An account earns simple interest. $1675 at 4.6% for 4 years a. Find the interest earned. $___ b. Find the balance of the account

Colt1911 [192]

A. First, divide 1675 by 100 to find 1% of it.
1675 / 100 = 16.75
Then, multiply 16.75 by 4.6 to get 4.6%.
16.75 x 4.6 = 77.05
77.05 is the interest for one year.
Multiply it by 4 to get the interest for 4 years.
77.05 x 4 = 308.20
The interest earned is $308.20.

B. Add the interest to the original balance to get the total.
308.20 + 1675 = 1983.20
The balance of the account is $1983.20 after 4 years.

Hope this help!

7 0

3 years ago

I need help not sure how to answer this​

I need help not sure how to answer this